18958375690 has 32 divisors (see below), whose sum is σ = 36490213584. Its totient is φ = 7066598400.

The previous prime is 18958375643. The next prime is 18958375703. The reversal of 18958375690 is 9657385981.

It can be written as a sum of positive squares in 8 ways, for example, as 10257030729 + 8701344961 = 101277^2 + 93281^2 .

It is a super-2 number, since 2×18958375690² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534909 + ... + 569248.

Almost surely, 2^18958375690 is an apocalyptic number.

18958375690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18958375690 is a deficient number, since it is larger than the sum of its proper divisors (17531837894).

18958375690 is a wasteful number, since it uses less digits than its factorization.

18958375690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104282.

The product of its (nonzero) digits is 16329600, while the sum is 61.

The spelling of 18958375690 in words is "eighteen billion, nine hundred fifty-eight million, three hundred seventy-five thousand, six hundred ninety".