18662904457 has 2 divisors, whose sum is σ = 18662904458. Its totient is φ = 18662904456.

The previous prime is 18662904437. The next prime is 18662904461. The reversal of 18662904457 is 75440926681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14949708361 + 3713196096 = 122269^2 + 60936^2 .

It is a cyclic number.

It is not a de Polignac number, because 18662904457 - 2¹⁹ = 18662380169 is a prime.

It is a super-2 number, since 2×18662904457² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18662904437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9331452228 + 9331452229.

It is an arithmetic number, because the mean of its divisors is an integer number (9331452229).

Almost surely, 2^18662904457 is an apocalyptic number.

It is an amenable number.

18662904457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18662904457 is an equidigital number, since it uses as much as digits as its factorization.

18662904457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 18662904457 in words is "eighteen billion, six hundred sixty-two million, nine hundred four thousand, four hundred fifty-seven".