40181621015 has 4 divisors (see below), whose sum is σ = 48217945224. Its totient is φ = 32145296808.

The previous prime is 40181620987. The next prime is 40181621057. The reversal of 40181621015 is 51012618104.

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

It is a cyclic number.

It is not a de Polignac number, because 40181621015 - 2¹² = 40181616919 is a prime.

It is a super-2 number, since 2×40181621015² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4018162097 + ... + 4018162106.

It is an arithmetic number, because the mean of its divisors is an integer number (12054486306).

Almost surely, 2^40181621015 is an apocalyptic number.

40181621015 is a deficient number, since it is larger than the sum of its proper divisors (8036324209).

40181621015 is an equidigital number, since it uses as much as digits as its factorization.

40181621015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8036324208.

The product of its (nonzero) digits is 1920, while the sum is 29.

The spelling of 40181621015 in words is "forty billion, one hundred eighty-one million, six hundred twenty-one thousand, fifteen".