81646654284 has 72 divisors (see below), whose sum is σ = 228267421200. Its totient is φ = 24443068032.

The previous prime is 81646654277. The next prime is 81646654291. The reversal of 81646654284 is 48245664618.

81646654284 is a `hidden beast` number, since 8 + 16 + 4 + 6 + 6 + 542 + 84 = 666.

It is an interprime number because it is at equal distance from previous prime (81646654277) and next prime (81646654291).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81646654284.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2340234 + ... + 2374865.

It is an arithmetic number, because the mean of its divisors is an integer number (3170380850).

Almost surely, 2^81646654284 is an apocalyptic number.

It is an amenable number.

81646654284 is an abundant number, since it is smaller than the sum of its proper divisors (146620766916).

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

81646654284 is a wasteful number, since it uses less digits than its factorization.

81646654284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4715159 (or 4715154 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 54.

The spelling of 81646654284 in words is "eighty-one billion, six hundred forty-six million, six hundred fifty-four thousand, two hundred eighty-four".