18988455666590 has 16 divisors (see below), whose sum is σ = 34217753722272. Its totient is φ = 7586819261664.

The previous prime is 18988455666553. The next prime is 18988455666619. The reversal of 18988455666590 is 9566655488981.

It is a super-2 number, since 2×18988455666590² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1070366309 + ... + 1070384048.

It is an arithmetic number, because the mean of its divisors is an integer number (2138609607642).

Almost surely, 2^{18988455666590} is an apocalyptic number.

18988455666590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18988455666590 is a deficient number, since it is larger than the sum of its proper divisors (15229298055682).

18988455666590 is a wasteful number, since it uses less digits than its factorization.

18988455666590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140751251.

The product of its (nonzero) digits is 4478976000, while the sum is 80.

The spelling of 18988455666590 in words is "eighteen trillion, nine hundred eighty-eight billion, four hundred fifty-five million, six hundred sixty-six thousand, five hundred ninety".