18718047557 has 16 divisors (see below), whose sum is σ = 22080874752. Its totient is φ = 15674680320.

The previous prime is 18718047553. The next prime is 18718047629. The reversal of 18718047557 is 75574081781.

It is a cyclic number.

It is not a de Polignac number, because 18718047557 - 2² = 18718047553 is a prime.

It is a super-2 number, since 2×18718047557² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18718047499 and 18718047508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18718047553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1056068 + ... + 1073645.

It is an arithmetic number, because the mean of its divisors is an integer number (1380054672).

Almost surely, 2^18718047557 is an apocalyptic number.

18718047557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18718047557 is a deficient number, since it is larger than the sum of its proper divisors (3362827195).

18718047557 is a wasteful number, since it uses less digits than its factorization.

18718047557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2129788.

The product of its (nonzero) digits is 2195200, while the sum is 53.

The spelling of 18718047557 in words is "eighteen billion, seven hundred eighteen million, forty-seven thousand, five hundred fifty-seven".