18866774460 has 24 divisors (see below), whose sum is σ = 52826968656. Its totient is φ = 5031139840.

The previous prime is 18866774419. The next prime is 18866774477. The reversal of 18866774460 is 6447766881.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18866774460.

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, 157223061 + ... + 157223180.

It is an arithmetic number, because the mean of its divisors is an integer number (2201123694).

Almost surely, 2^18866774460 is an apocalyptic number.

18866774460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18866774460 is an abundant number, since it is smaller than the sum of its proper divisors (33960194196).

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

18866774460 is a wasteful number, since it uses less digits than its factorization.

18866774460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314446253 (or 314446251 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 57.

The spelling of 18866774460 in words is "eighteen billion, eight hundred sixty-six million, seven hundred seventy-four thousand, four hundred sixty".