81976906467 has 8 divisors (see below), whose sum is σ = 121447268880. Its totient is φ = 54651270960.

The previous prime is 81976906441. The next prime is 81976906481. The reversal of 81976906467 is 76460967918.

81976906467 is a `hidden beast` number, since 8 + 19 + 76 + 90 + 6 + 467 = 666.

It is not a de Polignac number, because 81976906467 - 2¹⁹ = 81976382179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81976906367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1518090834 + ... + 1518090887.

It is an arithmetic number, because the mean of its divisors is an integer number (15180908610).

Almost surely, 2^81976906467 is an apocalyptic number.

81976906467 is a deficient number, since it is larger than the sum of its proper divisors (39470362413).

81976906467 is a wasteful number, since it uses less digits than its factorization.

81976906467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036181730 (or 3036181724 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 81976906467 in words is "eighty-one billion, nine hundred seventy-six million, nine hundred six thousand, four hundred sixty-seven".