18866774628 has 72 divisors (see below), whose sum is σ = 52009776000. Its totient is φ = 5731667136.

The previous prime is 18866774621. The next prime is 18866774629. The reversal of 18866774628 is 82647766881.

It is not an unprimeable number, because it can be changed into a prime (18866774621) 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, 218178 + ... + 292121.

It is an arithmetic number, because the mean of its divisors is an integer number (722358000).

Almost surely, 2^18866774628 is an apocalyptic number.

18866774628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18866774628 is an abundant number, since it is smaller than the sum of its proper divisors (33143001372).

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

18866774628 is a wasteful number, since it uses less digits than its factorization.

18866774628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510401 (or 510396 counting only the distinct ones).

The product of its digits is 43352064, while the sum is 63.

The spelling of 18866774628 in words is "eighteen billion, eight hundred sixty-six million, seven hundred seventy-four thousand, six hundred twenty-eight".