18661258235168 has 12 divisors (see below), whose sum is σ = 36739352150550. Its totient is φ = 9330629117568.

The previous prime is 18661258235153. The next prime is 18661258235183. The reversal of 18661258235168 is 86153285216681.

It is an interprime number because it is at equal distance from previous prime (18661258235153) and next prime (18661258235183).

It can be written as a sum of positive squares in only one way, i.e., 18066342204304 + 594916030864 = 4250452^2 + 771308^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18661258235168.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 291582159893 + ... + 291582159956.

Almost surely, 2^{18661258235168} is an apocalyptic number.

It is an amenable number.

18661258235168 is a deficient number, since it is larger than the sum of its proper divisors (18078093915382).

18661258235168 is an equidigital number, since it uses as much as digits as its factorization.

18661258235168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583164319859 (or 583164319851 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 62.

The spelling of 18661258235168 in words is "eighteen trillion, six hundred sixty-one billion, two hundred fifty-eight million, two hundred thirty-five thousand, one hundred sixty-eight".