81950949672 has 32 divisors (see below), whose sum is σ = 204895111680. Its totient is φ = 27314618240.

The previous prime is 81950949667. The next prime is 81950949727. The reversal of 81950949672 is 27694905918.

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, 147193 + ... + 430775.

It is an arithmetic number, because the mean of its divisors is an integer number (6402972240).

Almost surely, 2^81950949672 is an apocalyptic number.

It is an amenable number.

81950949672 is an abundant number, since it is smaller than the sum of its proper divisors (122944162008).

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

81950949672 is a wasteful number, since it uses less digits than its factorization.

81950949672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295633 (or 295629 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 60.

The spelling of 81950949672 in words is "eighty-one billion, nine hundred fifty million, nine hundred forty-nine thousand, six hundred seventy-two".