81974674160 has 20 divisors (see below), whose sum is σ = 190591117608. Its totient is φ = 32789869632.

The previous prime is 81974674151. The next prime is 81974674181. The reversal of 81974674160 is 6147647918.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512341634 + ... + 512341793.

Almost surely, 2^81974674160 is an apocalyptic number.

81974674160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81974674160 is an abundant number, since it is smaller than the sum of its proper divisors (108616443448).

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

81974674160 is a wasteful number, since it uses less digits than its factorization.

81974674160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024683440 (or 1024683434 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 81974674160 in words is "eighty-one billion, nine hundred seventy-four million, six hundred seventy-four thousand, one hundred sixty".