11572722657 has 12 divisors (see below), whose sum is σ = 16718385684. Its totient is φ = 7714118880.

The previous prime is 11572722653. The next prime is 11572722677. The reversal of 11572722657 is 75622727511.

11572722657 is a `hidden beast` number, since 1 + 1 + 572 + 7 + 2 + 26 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 365536161 + 11207186496 = 19119^2 + 105864^2 .

It is not a de Polignac number, because 11572722657 - 2² = 11572722653 is a prime.

It is a super-2 number, since 2×11572722657² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11572722653) by changing a digit.

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, 11194 + ... + 152547.

It is an arithmetic number, because the mean of its divisors is an integer number (1393198807).

Almost surely, 2^11572722657 is an apocalyptic number.

It is an amenable number.

11572722657 is a deficient number, since it is larger than the sum of its proper divisors (5145663027).

11572722657 is a wasteful number, since it uses less digits than its factorization.

11572722657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171600 (or 171597 counting only the distinct ones).

The product of its digits is 411600, while the sum is 45.

It can be divided in two parts, 1157272 and 2657, that added together give a square (1159929 = 1077²).

The spelling of 11572722657 in words is "eleven billion, five hundred seventy-two million, seven hundred twenty-two thousand, six hundred fifty-seven".