18908572557 has 8 divisors (see below), whose sum is σ = 28813062976. Its totient is φ = 10804898592.

The previous prime is 18908572549. The next prime is 18908572561. The reversal of 18908572557 is 75527580981.

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

It is not a de Polignac number, because 18908572557 - 2³ = 18908572549 is a prime.

It is a super-2 number, since 2×18908572557² (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 = 18908572497 and 18908572506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18908572157) 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, 450204088 + ... + 450204129.

It is an arithmetic number, because the mean of its divisors is an integer number (3601632872).

Almost surely, 2^18908572557 is an apocalyptic number.

It is an amenable number.

18908572557 is a deficient number, since it is larger than the sum of its proper divisors (9904490419).

18908572557 is an equidigital number, since it uses as much as digits as its factorization.

18908572557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900408227.

The product of its (nonzero) digits is 7056000, while the sum is 57.

The spelling of 18908572557 in words is "eighteen billion, nine hundred eight million, five hundred seventy-two thousand, five hundred fifty-seven".