81650308608 has 160 divisors (see below), whose sum is σ = 263662945920. Its totient is φ = 24742471680.

The previous prime is 81650308603. The next prime is 81650308631. The reversal of 81650308608 is 80680305618.

81650308608 is a `hidden beast` number, since 8 + 1 + 6 + 5 + 0 + 30 + 8 + 608 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81650308603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116410 + ... + 420537.

It is an arithmetic number, because the mean of its divisors is an integer number (1647893412).

Almost surely, 2^81650308608 is an apocalyptic number.

81650308608 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81650308608 is an abundant number, since it is smaller than the sum of its proper divisors (182012637312).

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

81650308608 is a wasteful number, since it uses less digits than its factorization.

81650308608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536985 (or 536963 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 81650308608 in words is "eighty-one billion, six hundred fifty million, three hundred eight thousand, six hundred eight".