40197461535821 has 8 divisors (see below), whose sum is σ = 40655594855160. Its totient is φ = 39739472137728.

The previous prime is 40197461535799. The next prime is 40197461535851. The reversal of 40197461535821 is 12853516479104.

40197461535821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 25330183068100 + 14867278467721 = 5032910^2 + 3855811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40197461535821 - 2³⁰ = 40196387793997 is a prime.

It is a super-2 number, since 2×40197461535821² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40197461535851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35418476 + ... + 36535781.

It is an arithmetic number, because the mean of its divisors is an integer number (5081949356895).

It is a 1-persistent number, because it is pandigital, but 2⋅40197461535821 = 80394923071642 is not.

Almost surely, 2^{40197461535821} is an apocalyptic number.

It is an amenable number.

40197461535821 is a deficient number, since it is larger than the sum of its proper divisors (458133319339).

40197461535821 is an equidigital number, since it uses as much as digits as its factorization.

40197461535821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71960623.

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 40197461535821 in words is "forty trillion, one hundred ninety-seven billion, four hundred sixty-one million, five hundred thirty-five thousand, eight hundred twenty-one".