2157940640439 has 12 divisors (see below), whose sum is σ = 3281079336600. Its totient is φ = 1362909878064.

The previous prime is 2157940640413. The next prime is 2157940640489. The reversal of 2157940640439 is 9340460497512.

2157940640439 is a `hidden beast` number, since 2 + 1 + 579 + 4 + 0 + 64 + 0 + 4 + 3 + 9 = 666.

It is not a de Polignac number, because 2157940640439 - 2¹² = 2157940636343 is a prime.

It is a super-2 number, since 2×2157940640439² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157940640489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6309767784 + ... + 6309768125.

It is an arithmetic number, because the mean of its divisors is an integer number (273423278050).

Almost surely, 2^{2157940640439} is an apocalyptic number.

2157940640439 is a deficient number, since it is larger than the sum of its proper divisors (1123138696161).

2157940640439 is a wasteful number, since it uses less digits than its factorization.

2157940640439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12619535934 (or 12619535931 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 2157940640439 in words is "two trillion, one hundred fifty-seven billion, nine hundred forty million, six hundred forty thousand, four hundred thirty-nine".