81976906466 has 32 divisors (see below), whose sum is σ = 151366631808. Its totient is φ = 32425142400.

The previous prime is 81976906441. The next prime is 81976906481. The reversal of 81976906466 is 66460967918.

It is a junction number, because it is equal to n+sod(n) for n = 81976906399 and 81976906408.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1197566 + ... + 1264166.

It is an arithmetic number, because the mean of its divisors is an integer number (4730207244).

Almost surely, 2^81976906466 is an apocalyptic number.

81976906466 is a deficient number, since it is larger than the sum of its proper divisors (69389725342).

81976906466 is a wasteful number, since it uses less digits than its factorization.

81976906466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73386.

The product of its (nonzero) digits is 23514624, while the sum is 62.

The spelling of 81976906466 in words is "eighty-one billion, nine hundred seventy-six million, nine hundred six thousand, four hundred sixty-six".