11857997532 has 24 divisors (see below), whose sum is σ = 28343507472. Its totient is φ = 3856259200.

The previous prime is 11857997497. The next prime is 11857997537. The reversal of 11857997532 is 23579975811.

It is a super-2 number, since 2×11857997532² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11857997537) 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, 12050319 + ... + 12051302.

It is an arithmetic number, because the mean of its divisors is an integer number (1180979478).

Almost surely, 2^11857997532 is an apocalyptic number.

11857997532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11857997532 is an abundant number, since it is smaller than the sum of its proper divisors (16485509940).

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

11857997532 is a wasteful number, since it uses less digits than its factorization.

11857997532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24101669 (or 24101667 counting only the distinct ones).

The product of its digits is 4762800, while the sum is 57.

The spelling of 11857997532 in words is "eleven billion, eight hundred fifty-seven million, nine hundred ninety-seven thousand, five hundred thirty-two".