15401692315561 has 4 divisors (see below), whose sum is σ = 15401772721792. Its totient is φ = 15401611909332.

The previous prime is 15401692315549. The next prime is 15401692315651. The reversal of 15401692315561 is 16551329610451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15401692315561 - 2³⁷ = 15264253362089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15401692315511) 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, 39915105 + ... + 40299118.

It is an arithmetic number, because the mean of its divisors is an integer number (3850443180448).

Almost surely, 2^{15401692315561} is an apocalyptic number.

It is an amenable number.

15401692315561 is a deficient number, since it is larger than the sum of its proper divisors (80406231).

15401692315561 is an equidigital number, since it uses as much as digits as its factorization.

15401692315561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80406230.

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 15401692315561 in words is "fifteen trillion, four hundred one billion, six hundred ninety-two million, three hundred fifteen thousand, five hundred sixty-one".