18971772680 has 32 divisors (see below), whose sum is σ = 48784559040. Its totient is φ = 6504607680.

The previous prime is 18971772641. The next prime is 18971772689. The reversal of 18971772680 is 8627717981.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (18971772689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33877886 + ... + 33878445.

It is an arithmetic number, because the mean of its divisors is an integer number (1524517470).

Almost surely, 2^18971772680 is an apocalyptic number.

18971772680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18971772680 is an abundant number, since it is smaller than the sum of its proper divisors (29812786360).

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

18971772680 is a wasteful number, since it uses less digits than its factorization.

18971772680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67756349 (or 67756345 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 56.

The spelling of 18971772680 in words is "eighteen billion, nine hundred seventy-one million, seven hundred seventy-two thousand, six hundred eighty".