15516565056001 has 4 divisors (see below), whose sum is σ = 15516760802004. Its totient is φ = 15516369310000.

The previous prime is 15516565055993. The next prime is 15516565056023. The reversal of 15516565056001 is 10065056561551.

It is a happy number.

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 6954059073025 + 8562505982976 = 2637055^2 + 2926176^2 .

It is a cyclic number.

It is not a de Polignac number, because 15516565056001 - 2³ = 15516565055993 is a prime.

It is a super-2 number, since 2×15516565056001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15516565056301) 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, 97754050 + ... + 97912651.

It is an arithmetic number, because the mean of its divisors is an integer number (3879190200501).

Almost surely, 2^{15516565056001} is an apocalyptic number.

It is an amenable number.

15516565056001 is a deficient number, since it is larger than the sum of its proper divisors (195746003).

15516565056001 is an equidigital number, since it uses as much as digits as its factorization.

15516565056001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195746002.

The product of its (nonzero) digits is 675000, while the sum is 46.

The spelling of 15516565056001 in words is "fifteen trillion, five hundred sixteen billion, five hundred sixty-five million, fifty-six thousand, one".