81450662372 has 6 divisors (see below), whose sum is σ = 142538659158. Its totient is φ = 40725331184.

The previous prime is 81450662357. The next prime is 81450662401. The reversal of 81450662372 is 27326605418.

It can be written as a sum of positive squares in only one way, i.e., 66720956416 + 14729705956 = 258304^2 + 121366^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10181332793 + ... + 10181332800.

It is an arithmetic number, because the mean of its divisors is an integer number (23756443193).

Almost surely, 2^81450662372 is an apocalyptic number.

It is an amenable number.

81450662372 is a deficient number, since it is larger than the sum of its proper divisors (61087996786).

81450662372 is a wasteful number, since it uses less digits than its factorization.

81450662372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20362665597 (or 20362665595 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 81450662372 in words is "eighty-one billion, four hundred fifty million, six hundred sixty-two thousand, three hundred seventy-two".