18071977252 has 24 divisors (see below), whose sum is σ = 36147653696. Its totient is φ = 7744340448.

The previous prime is 18071977237. The next prime is 18071977277. The reversal of 18071977252 is 25277917081.

It is a junction number, because it is equal to n+sod(n) for n = 18071977196 and 18071977205.

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, 306778 + ... + 360910.

Almost surely, 2^18071977252 is an apocalyptic number.

It is an amenable number.

18071977252 is an abundant number, since it is smaller than the sum of its proper divisors (18075676444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18071977252 is a wasteful number, since it uses less digits than its factorization.

18071977252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66067 (or 66065 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 49.

The spelling of 18071977252 in words is "eighteen billion, seventy-one million, nine hundred seventy-seven thousand, two hundred fifty-two".