11572551261 has 12 divisors (see below), whose sum is σ = 16818461088. Its totient is φ = 7667701704.

The previous prime is 11572551233. The next prime is 11572551271. The reversal of 11572551261 is 16215527511.

11572551261 is a `hidden beast` number, since 1 + 15 + 72 + 5 + 512 + 61 = 666.

It is not a de Polignac number, because 11572551261 - 2⁵ = 11572551229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11572551271) 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, 3942825 + ... + 3945758.

It is an arithmetic number, because the mean of its divisors is an integer number (1401538424).

Almost surely, 2^11572551261 is an apocalyptic number.

It is an amenable number.

11572551261 is a deficient number, since it is larger than the sum of its proper divisors (5245909827).

11572551261 is a wasteful number, since it uses less digits than its factorization.

11572551261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7888752 (or 7888749 counting only the distinct ones).

The product of its digits is 21000, while the sum is 36.

The spelling of 11572551261 in words is "eleven billion, five hundred seventy-two million, five hundred fifty-one thousand, two hundred sixty-one".