18775629971237 has 2 divisors, whose sum is σ = 18775629971238. Its totient is φ = 18775629971236.

The previous prime is 18775629971201. The next prime is 18775629971321. The reversal of 18775629971237 is 73217992657781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13038642140836 + 5736987830401 = 3610906^2 + 2395201^2 .

It is a cyclic number.

It is not a de Polignac number, because 18775629971237 - 2⁶ = 18775629971173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18775629979237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9387814985618 + 9387814985619.

It is an arithmetic number, because the mean of its divisors is an integer number (9387814985619).

Almost surely, 2^{18775629971237} is an apocalyptic number.

It is an amenable number.

18775629971237 is a deficient number, since it is larger than the sum of its proper divisors (1).

18775629971237 is an equidigital number, since it uses as much as digits as its factorization.

18775629971237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 560105280, while the sum is 74.

The spelling of 18775629971237 in words is "eighteen trillion, seven hundred seventy-five billion, six hundred twenty-nine million, nine hundred seventy-one thousand, two hundred thirty-seven".