15775297645 has 12 divisors (see below), whose sum is σ = 20109412404. Its totient is φ = 11877870080.

The previous prime is 15775297627. The next prime is 15775297673. The reversal of 15775297645 is 54679257751.

It can be written as a sum of positive squares in 6 ways, for example, as 736199689 + 15039097956 = 27133^2 + 122634^2 .

It is not a de Polignac number, because 15775297645 - 2²⁷ = 15641079917 is a prime.

It is a super-3 number, since 3×15775297645³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15775297645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5457136 + ... + 5460025.

It is an arithmetic number, because the mean of its divisors is an integer number (1675784367).

Almost surely, 2^15775297645 is an apocalyptic number.

It is an amenable number.

15775297645 is a deficient number, since it is larger than the sum of its proper divisors (4334114759).

15775297645 is a wasteful number, since it uses less digits than its factorization.

15775297645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10917200 (or 10917183 counting only the distinct ones).

The product of its digits is 18522000, while the sum is 58.

The spelling of 15775297645 in words is "fifteen billion, seven hundred seventy-five million, two hundred ninety-seven thousand, six hundred forty-five".