11857897737 has 18 divisors (see below), whose sum is σ = 19924495578. Its totient is φ = 6775941312.

The previous prime is 11857897729. The next prime is 11857897747. The reversal of 11857897737 is 73779875811.

It can be written as a sum of positive squares in only one way, i.e., 10029822201 + 1828075536 = 100149^2 + 42756^2 .

It is not a de Polignac number, because 11857897737 - 2³ = 11857897729 is a prime.

It is a super-2 number, since 2×11857897737² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (11857897747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13443888 + ... + 13444769.

It is an arithmetic number, because the mean of its divisors is an integer number (1106916421).

Almost surely, 2^11857897737 is an apocalyptic number.

It is an amenable number.

11857897737 is a deficient number, since it is larger than the sum of its proper divisors (8066597841).

11857897737 is a wasteful number, since it uses less digits than its factorization.

11857897737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26888677 (or 26888667 counting only the distinct ones).

The product of its digits is 20744640, while the sum is 63.

The spelling of 11857897737 in words is "eleven billion, eight hundred fifty-seven million, eight hundred ninety-seven thousand, seven hundred thirty-seven".