81479202168 has 64 divisors (see below), whose sum is σ = 250705244160. Its totient is φ = 21489019776.

The previous prime is 81479202151. The next prime is 81479202179. The reversal of 81479202168 is 86120297418.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18651480 + ... + 18655847.

It is an arithmetic number, because the mean of its divisors is an integer number (3917269440).

Almost surely, 2^81479202168 is an apocalyptic number.

It is an amenable number.

81479202168 is an abundant number, since it is smaller than the sum of its proper divisors (169226041992).

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

81479202168 is a wasteful number, since it uses less digits than its factorization.

81479202168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37307356 (or 37307352 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The spelling of 81479202168 in words is "eighty-one billion, four hundred seventy-nine million, two hundred two thousand, one hundred sixty-eight".