18537020057 has 2 divisors, whose sum is σ = 18537020058. Its totient is φ = 18537020056.

The previous prime is 18537019979. The next prime is 18537020129. The reversal of 18537020057 is 75002073581.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14849615881 + 3687404176 = 121859^2 + 60724^2 .

It is a cyclic number.

It is not a de Polignac number, because 18537020057 - 2¹⁸ = 18536757913 is a prime.

It is a super-2 number, since 2×18537020057² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18537020057.

It is not a weakly prime, because it can be changed into another prime (18537020357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9268510028 + 9268510029.

It is an arithmetic number, because the mean of its divisors is an integer number (9268510029).

Almost surely, 2^18537020057 is an apocalyptic number.

It is an amenable number.

18537020057 is a deficient number, since it is larger than the sum of its proper divisors (1).

18537020057 is an equidigital number, since it uses as much as digits as its factorization.

18537020057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58800, while the sum is 38.

The spelling of 18537020057 in words is "eighteen billion, five hundred thirty-seven million, twenty thousand, fifty-seven".