72411561657 has 10 divisors (see below), whose sum is σ = 108170357658. Its totient is φ = 48274374384.

The previous prime is 72411561643. The next prime is 72411561661. The reversal of 72411561657 is 75616511427.

72411561657 is a `hidden beast` number, since 7 + 24 + 1 + 1 + 5 + 616 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 42834097296 + 29577464361 = 206964^2 + 171981^2 .

It is not a de Polignac number, because 72411561657 - 2¹⁶ = 72411496121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72411551657) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 446984868 + ... + 446985029.

Almost surely, 2^72411561657 is an apocalyptic number.

It is an amenable number.

72411561657 is a deficient number, since it is larger than the sum of its proper divisors (35758796001).

72411561657 is an equidigital number, since it uses as much as digits as its factorization.

72411561657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893969909 (or 893969900 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The spelling of 72411561657 in words is "seventy-two billion, four hundred eleven million, five hundred sixty-one thousand, six hundred fifty-seven".