18151217020 has 24 divisors (see below), whose sum is σ = 38494961568. Its totient is φ = 7188600000.

The previous prime is 18151217017. The next prime is 18151217041. The reversal of 18151217020 is 2071215181.

It is a self number, because there is not a number n which added to its sum of digits gives 18151217020.

It is a congruent number.

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, 4490856 + ... + 4494895.

It is an arithmetic number, because the mean of its divisors is an integer number (1603956732).

Almost surely, 2^18151217020 is an apocalyptic number.

18151217020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18151217020 is an abundant number, since it is smaller than the sum of its proper divisors (20343744548).

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

18151217020 is a wasteful number, since it uses less digits than its factorization.

18151217020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8985861 (or 8985859 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 28.

The spelling of 18151217020 in words is "eighteen billion, one hundred fifty-one million, two hundred seventeen thousand, twenty".