81635879032 has 8 divisors (see below), whose sum is σ = 153067273200. Its totient is φ = 40817939512.

The previous prime is 81635878999. The next prime is 81635879051. The reversal of 81635879032 is 23097853618.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5102242432 + ... + 5102242447.

It is an arithmetic number, because the mean of its divisors is an integer number (19133409150).

Almost surely, 2^81635879032 is an apocalyptic number.

It is an amenable number.

81635879032 is a deficient number, since it is larger than the sum of its proper divisors (71431394168).

81635879032 is a wasteful number, since it uses less digits than its factorization.

81635879032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10204484885 (or 10204484881 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 81635879032 in words is "eighty-one billion, six hundred thirty-five million, eight hundred seventy-nine thousand, thirty-two".