18968349972 has 48 divisors (see below), whose sum is σ = 51997159872. Its totient is φ = 5305831680.

The previous prime is 18968349929. The next prime is 18968349979. The reversal of 18968349972 is 27994386981.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18968349979) 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, 5525193 + ... + 5528624.

It is an arithmetic number, because the mean of its divisors is an integer number (1083274164).

Almost surely, 2^18968349972 is an apocalyptic number.

18968349972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18968349972 is an abundant number, since it is smaller than the sum of its proper divisors (33028809900).

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

18968349972 is a wasteful number, since it uses less digits than its factorization.

18968349972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11053848 (or 11053846 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 66.

The spelling of 18968349972 in words is "eighteen billion, nine hundred sixty-eight million, three hundred forty-nine thousand, nine hundred seventy-two".