81417705579 has 40 divisors (see below), whose sum is σ = 139552858368. Its totient is φ = 46338966000.

The previous prime is 81417705547. The next prime is 81417705599. The reversal of 81417705579 is 97550771418.

81417705579 is a `hidden beast` number, since 8 + 1 + 4 + 17 + 70 + 557 + 9 = 666.

It is not a de Polignac number, because 81417705579 - 2⁵ = 81417705547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81417705599) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 143727 + ... + 428360.

Almost surely, 2^81417705579 is an apocalyptic number.

81417705579 is a deficient number, since it is larger than the sum of its proper divisors (58135152789).

81417705579 is a wasteful number, since it uses less digits than its factorization.

81417705579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572357 (or 572348 counting only the distinct ones).

The product of its (nonzero) digits is 2469600, while the sum is 54.

The spelling of 81417705579 in words is "eighty-one billion, four hundred seventeen million, seven hundred five thousand, five hundred seventy-nine".