18377874055553 has 2 divisors, whose sum is σ = 18377874055554. Its totient is φ = 18377874055552.

The previous prime is 18377874055537. The next prime is 18377874055573. The reversal of 18377874055553 is 35555047877381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17911237515889 + 466636539664 = 4232167^2 + 683108^2 .

It is an emirp because it is prime and its reverse (35555047877381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18377874055553 - 2⁴ = 18377874055537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18377874055523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9188937027776 + 9188937027777.

It is an arithmetic number, because the mean of its divisors is an integer number (9188937027777).

Almost surely, 2^{18377874055553} is an apocalyptic number.

It is an amenable number.

18377874055553 is a deficient number, since it is larger than the sum of its proper divisors (1).

18377874055553 is an equidigital number, since it uses as much as digits as its factorization.

18377874055553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 493920000, while the sum is 68.

The spelling of 18377874055553 in words is "eighteen trillion, three hundred seventy-seven billion, eight hundred seventy-four million, fifty-five thousand, five hundred fifty-three".