18951531612 has 24 divisors (see below), whose sum is σ = 47621797776. Its totient is φ = 5831240448.

The previous prime is 18951531611. The next prime is 18951531617. The reversal of 18951531612 is 21613515981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18951531611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60741933 + ... + 60742244.

It is an arithmetic number, because the mean of its divisors is an integer number (1984241574).

Almost surely, 2^18951531612 is an apocalyptic number.

18951531612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18951531612 is an abundant number, since it is smaller than the sum of its proper divisors (28670266164).

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

18951531612 is a wasteful number, since it uses less digits than its factorization.

18951531612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121484197 (or 121484195 counting only the distinct ones).

The product of its digits is 64800, while the sum is 42.

The spelling of 18951531612 in words is "eighteen billion, nine hundred fifty-one million, five hundred thirty-one thousand, six hundred twelve".