18987117052 has 6 divisors (see below), whose sum is σ = 33227454848. Its totient is φ = 9493558524.

The previous prime is 18987117041. The next prime is 18987117077. The reversal of 18987117052 is 25071178981.

It is a super-2 number, since 2×18987117052² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18987116987 and 18987117005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2373389628 + ... + 2373389635.

Almost surely, 2^18987117052 is an apocalyptic number.

It is an amenable number.

18987117052 is a deficient number, since it is larger than the sum of its proper divisors (14240337796).

18987117052 is a wasteful number, since it uses less digits than its factorization.

18987117052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4746779267 (or 4746779265 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 49.

The spelling of 18987117052 in words is "eighteen billion, nine hundred eighty-seven million, one hundred seventeen thousand, fifty-two".