18655705657 has 16 divisors (see below), whose sum is σ = 19457225424. Its totient is φ = 17871840000.

The previous prime is 18655705643. The next prime is 18655705661. The reversal of 18655705657 is 75650755681.

It can be written as a sum of positive squares in 8 ways, for example, as 4981677561 + 13674028096 = 70581^2 + 116936^2 .

It is a cyclic number.

It is not a de Polignac number, because 18655705657 - 2⁷ = 18655705529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18655705598 and 18655705607.

It is not an unprimeable number, because it can be changed into a prime (18655705637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 662607 + ... + 690187.

It is an arithmetic number, because the mean of its divisors is an integer number (1216076589).

Almost surely, 2^18655705657 is an apocalyptic number.

It is an amenable number.

18655705657 is a deficient number, since it is larger than the sum of its proper divisors (801519767).

18655705657 is a wasteful number, since it uses less digits than its factorization.

18655705657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27900.

The product of its (nonzero) digits is 8820000, while the sum is 55.

The spelling of 18655705657 in words is "eighteen billion, six hundred fifty-five million, seven hundred five thousand, six hundred fifty-seven".