81764066272 has 48 divisors (see below), whose sum is σ = 183992739840. Its totient is φ = 35037249408.

The previous prime is 81764066261. The next prime is 81764066291. The reversal of 81764066272 is 27266046718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2196229 + ... + 2233147.

It is an arithmetic number, because the mean of its divisors is an integer number (3833182080).

Almost surely, 2^81764066272 is an apocalyptic number.

It is an amenable number.

81764066272 is an abundant number, since it is smaller than the sum of its proper divisors (102228673568).

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

81764066272 is a wasteful number, since it uses less digits than its factorization.

81764066272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46823 (or 46815 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 81764066272 in words is "eighty-one billion, seven hundred sixty-four million, sixty-six thousand, two hundred seventy-two".