81576576477 has 192 divisors, whose sum is σ = 140753313792. Its totient is φ = 45059328000.

The previous prime is 81576576467. The next prime is 81576576493. The reversal of 81576576477 is 77467567518.

81576576477 is a `hidden beast` number, since 8 + 1 + 57 + 6 + 576 + 4 + 7 + 7 = 666.

It is not a de Polignac number, because 81576576477 - 2⁴ = 81576576461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81576576467) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 762397858 + ... + 762397964.

It is an arithmetic number, because the mean of its divisors is an integer number (733090176).

Almost surely, 2^81576576477 is an apocalyptic number.

It is an amenable number.

81576576477 is a deficient number, since it is larger than the sum of its proper divisors (59176737315).

81576576477 is a wasteful number, since it uses less digits than its factorization.

81576576477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352 (or 349 counting only the distinct ones).

The product of its digits is 69148800, while the sum is 63.

The spelling of 81576576477 in words is "eighty-one billion, five hundred seventy-six million, five hundred seventy-six thousand, four hundred seventy-seven".