18520407612 has 72 divisors (see below), whose sum is σ = 53542035456. Its totient is φ = 5287724064.

The previous prime is 18520407611. The next prime is 18520407637. The reversal of 18520407612 is 21670402581.

18520407612 is a `hidden beast` number, since 18 + 5 + 20 + 4 + 0 + 7 + 612 = 666.

It is a super-2 number, since 2×18520407612² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520407611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 332773 + ... + 384419.

Almost surely, 2^18520407612 is an apocalyptic number.

18520407612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18520407612 is an abundant number, since it is smaller than the sum of its proper divisors (35021627844).

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

18520407612 is a wasteful number, since it uses less digits than its factorization.

18520407612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53087 (or 53082 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 18520407612 in words is "eighteen billion, five hundred twenty million, four hundred seven thousand, six hundred twelve".