159640551657 has 12 divisors (see below), whose sum is σ = 230595373060. Its totient is φ = 106425435168.

The previous prime is 159640551647. The next prime is 159640551709. The reversal of 159640551657 is 756155046951.

It is a happy number.

159640551657 is a `hidden beast` number, since 1 + 596 + 40 + 5 + 5 + 1 + 6 + 5 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 101856084201 + 57784467456 = 319149^2 + 240384^2 .

It is not a de Polignac number, because 159640551657 - 2¹¹ = 159640549609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159640551647) 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, 1086423 + ... + 1224579.

Almost surely, 2^159640551657 is an apocalyptic number.

It is an amenable number.

159640551657 is a deficient number, since it is larger than the sum of its proper divisors (70954821403).

159640551657 is a wasteful number, since it uses less digits than its factorization.

159640551657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266552 (or 266549 counting only the distinct ones).

The product of its (nonzero) digits is 5670000, while the sum is 54.

The spelling of 159640551657 in words is "one hundred fifty-nine billion, six hundred forty million, five hundred fifty-one thousand, six hundred fifty-seven".