40636316521 has 4 divisors (see below), whose sum is σ = 40640876500. Its totient is φ = 40631756544.

The previous prime is 40636316477. The next prime is 40636316527. The reversal of 40636316521 is 12561363604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22842090496 + 17794226025 = 151136^2 + 133395^2 .

It is a cyclic number.

It is not a de Polignac number, because 40636316521 - 2⁷ = 40636316393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40636316527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2266596 + ... + 2284453.

It is an arithmetic number, because the mean of its divisors is an integer number (10160219125).

Almost surely, 2^40636316521 is an apocalyptic number.

It is an amenable number.

40636316521 is a deficient number, since it is larger than the sum of its proper divisors (4559979).

40636316521 is an equidigital number, since it uses as much as digits as its factorization.

40636316521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4559978.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 40636316521 in words is "forty billion, six hundred thirty-six million, three hundred sixteen thousand, five hundred twenty-one".