18858061220 has 12 divisors (see below), whose sum is σ = 39601928604. Its totient is φ = 7543224480.

The previous prime is 18858061207. The next prime is 18858061237. The reversal of 18858061220 is 2216085881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9302216704 + 9555844516 = 96448^2 + 97754^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471451511 + ... + 471451550.

It is an arithmetic number, because the mean of its divisors is an integer number (3300160717).

Almost surely, 2^18858061220 is an apocalyptic number.

18858061220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18858061220 is an abundant number, since it is smaller than the sum of its proper divisors (20743867384).

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

18858061220 is a wasteful number, since it uses less digits than its factorization.

18858061220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942903070 (or 942903068 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 41.

The spelling of 18858061220 in words is "eighteen billion, eight hundred fifty-eight million, sixty-one thousand, two hundred twenty".