81966714616 has 32 divisors (see below), whose sum is σ = 163376423280. Its totient is φ = 38418880000.

The previous prime is 81966714581. The next prime is 81966714659. The reversal of 81966714616 is 61641766918.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1166455 + ... + 1234726.

Almost surely, 2^81966714616 is an apocalyptic number.

It is an amenable number.

81966714616 is a deficient number, since it is larger than the sum of its proper divisors (81409708664).

81966714616 is a wasteful number, since it uses less digits than its factorization.

81966714616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401455 (or 2401451 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 55.

The spelling of 81966714616 in words is "eighty-one billion, nine hundred sixty-six million, seven hundred fourteen thousand, six hundred sixteen".