81620996346 has 24 divisors (see below), whose sum is σ = 182550186624. Its totient is φ = 26329353480.

The previous prime is 81620996329. The next prime is 81620996357. The reversal of 81620996346 is 64369902618.

81620996346 is a `hidden beast` number, since 8 + 1 + 6 + 209 + 96 + 346 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 81620996292 and 81620996301.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73136536 + ... + 73137651.

It is an arithmetic number, because the mean of its divisors is an integer number (7606257776).

Almost surely, 2^81620996346 is an apocalyptic number.

81620996346 is an abundant number, since it is smaller than the sum of its proper divisors (100929190278).

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

81620996346 is a wasteful number, since it uses less digits than its factorization.

81620996346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146274226 (or 146274223 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 81620996346 in words is "eighty-one billion, six hundred twenty million, nine hundred ninety-six thousand, three hundred forty-six".