18868621530 has 32 divisors (see below), whose sum is σ = 49401482688. Its totient is φ = 4574211200.

The previous prime is 18868621501. The next prime is 18868621537. The reversal of 18868621530 is 3512686881.

It is a self number, because there is not a number n which added to its sum of digits gives 18868621530.

It is not an unprimeable number, because it can be changed into a prime (18868621537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28588491 + ... + 28589150.

It is an arithmetic number, because the mean of its divisors is an integer number (1543796334).

Almost surely, 2^18868621530 is an apocalyptic number.

18868621530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18868621530 is an abundant number, since it is smaller than the sum of its proper divisors (30532861158).

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

18868621530 is a wasteful number, since it uses less digits than its factorization.

18868621530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57177662.

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 18868621530 in words is "eighteen billion, eight hundred sixty-eight million, six hundred twenty-one thousand, five hundred thirty".