18377874055501 has 2 divisors, whose sum is σ = 18377874055502. Its totient is φ = 18377874055500.

The previous prime is 18377874055451. The next prime is 18377874055507. The reversal of 18377874055501 is 10555047877381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16283121505225 + 2094752550276 = 4035235^2 + 1447326^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18377874055501 is a prime.

It is a super-2 number, since 2×18377874055501² (a number of 27 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 18377874055501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18377874055507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9188937027750 + 9188937027751.

It is an arithmetic number, because the mean of its divisors is an integer number (9188937027751).

Almost surely, 2^{18377874055501} is an apocalyptic number.

It is an amenable number.

18377874055501 is a deficient number, since it is larger than the sum of its proper divisors (1).

18377874055501 is an equidigital number, since it uses as much as digits as its factorization.

18377874055501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32928000, while the sum is 61.

The spelling of 18377874055501 in words is "eighteen trillion, three hundred seventy-seven billion, eight hundred seventy-four million, fifty-five thousand, five hundred one".