11571996258 has 16 divisors (see below), whose sum is σ = 25715547360. Its totient is φ = 3857332068.

The previous prime is 11571996257. The next prime is 11571996263. The reversal of 11571996258 is 85269917511.

It is a happy number.

11571996258 is a `hidden beast` number, since 1 + 1 + 5 + 7 + 1 + 9 + 9 + 625 + 8 = 666.

It is a super-2 number, since 2×11571996258² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 214296227 = 11571996258 / (1 + 1 + 5 + 7 + 1 + 9 + 9 + 6 + 2 + 5 + 8).

It is not an unprimeable number, because it can be changed into a prime (11571996257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107148060 + ... + 107148167.

It is an arithmetic number, because the mean of its divisors is an integer number (1607221710).

Almost surely, 2^11571996258 is an apocalyptic number.

11571996258 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11571996258 is an abundant number, since it is smaller than the sum of its proper divisors (14143551102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11571996258 is a wasteful number, since it uses less digits than its factorization.

11571996258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214296238 (or 214296232 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 54.

The spelling of 11571996258 in words is "eleven billion, five hundred seventy-one million, nine hundred ninety-six thousand, two hundred fifty-eight".