81613146164 has 24 divisors (see below), whose sum is σ = 156852612000. Its totient is φ = 36847909280.

The previous prime is 81613146143. The next prime is 81613146217. The reversal of 81613146164 is 46164131618.

It is a congruent number.

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, 6217754 + ... + 6230865.

It is an arithmetic number, because the mean of its divisors is an integer number (6535525500).

Almost surely, 2^81613146164 is an apocalyptic number.

It is an amenable number.

81613146164 is a deficient number, since it is larger than the sum of its proper divisors (75239465836).

81613146164 is a wasteful number, since it uses less digits than its factorization.

81613146164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12448783 (or 12448781 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The spelling of 81613146164 in words is "eighty-one billion, six hundred thirteen million, one hundred forty-six thousand, one hundred sixty-four".