81426463677 has 32 divisors (see below), whose sum is σ = 137553010560. Its totient is φ = 47161025280.

The previous prime is 81426463597. The next prime is 81426463681. The reversal of 81426463677 is 77636462418.

81426463677 is a `hidden beast` number, since 8 + 14 + 264 + 6 + 367 + 7 = 666.

It is not a de Polignac number, because 81426463677 - 2¹² = 81426459581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81426463687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6817099 + ... + 6829032.

It is an arithmetic number, because the mean of its divisors is an integer number (4298531580).

Almost surely, 2^81426463677 is an apocalyptic number.

It is an amenable number.

81426463677 is a deficient number, since it is larger than the sum of its proper divisors (56126546883).

81426463677 is a wasteful number, since it uses less digits than its factorization.

81426463677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13646170 (or 13646164 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 54.

The spelling of 81426463677 in words is "eighty-one billion, four hundred twenty-six million, four hundred sixty-three thousand, six hundred seventy-seven".