81689600176 has 20 divisors (see below), whose sum is σ = 158308397872. Its totient is φ = 40835820096.

The previous prime is 81689600143. The next prime is 81689600197. The reversal of 81689600176 is 67100698618.

It is a happy 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, 485895 + ... + 632038.

Almost surely, 2^81689600176 is an apocalyptic number.

It is an amenable number.

81689600176 is a deficient number, since it is larger than the sum of its proper divisors (76618797696).

81689600176 is a wasteful number, since it uses less digits than its factorization.

81689600176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122508 (or 1122502 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 81689600176 in words is "eighty-one billion, six hundred eighty-nine million, six hundred thousand, one hundred seventy-six".