18557377891919 has 8 divisors (see below), whose sum is σ = 18577777755648. Its totient is φ = 18536985960480.

The previous prime is 18557377891799. The next prime is 18557377891931. The reversal of 18557377891919 is 91919877375581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18557377891919 - 2²⁸ = 18557109456463 is a prime.

It is a super-2 number, since 2×18557377891919² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18557377891979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2704529 + ... + 6665525.

It is an arithmetic number, because the mean of its divisors is an integer number (2322222219456).

Almost surely, 2^{18557377891919} is an apocalyptic number.

18557377891919 is a deficient number, since it is larger than the sum of its proper divisors (20399863729).

18557377891919 is a wasteful number, since it uses less digits than its factorization.

18557377891919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3966145.

The product of its digits is 1200225600, while the sum is 80.

The spelling of 18557377891919 in words is "eighteen trillion, five hundred fifty-seven billion, three hundred seventy-seven million, eight hundred ninety-one thousand, nine hundred nineteen".