81646084074 has 16 divisors (see below), whose sum is σ = 163992995712. Its totient is φ = 27098556768.

The previous prime is 81646084067. The next prime is 81646084081. The reversal of 81646084074 is 47048064618.

It is an interprime number because it is at equal distance from previous prime (81646084067) and next prime (81646084081).

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, 29199634 + ... + 29202429.

It is an arithmetic number, because the mean of its divisors is an integer number (10249562232).

Almost surely, 2^81646084074 is an apocalyptic number.

81646084074 is an abundant number, since it is smaller than the sum of its proper divisors (82346911638).

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

81646084074 is a wasteful number, since it uses less digits than its factorization.

81646084074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58402301.

The product of its (nonzero) digits is 1032192, while the sum is 48.

The spelling of 81646084074 in words is "eighty-one billion, six hundred forty-six million, eighty-four thousand, seventy-four".