81577392347 has 8 divisors (see below), whose sum is σ = 90246949632. Its totient is φ = 73116740200.

The previous prime is 81577392307. The next prime is 81577392349. The reversal of 81577392347 is 74329377518.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81577392347 - 2¹⁸ = 81577130203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81577392292 and 81577392301.

It is not an unprimeable number, because it can be changed into a prime (81577392349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52225463 + ... + 52227024.

It is an arithmetic number, because the mean of its divisors is an integer number (11280868704).

Almost surely, 2^81577392347 is an apocalyptic number.

81577392347 is a deficient number, since it is larger than the sum of its proper divisors (8669557285).

81577392347 is a wasteful number, since it uses less digits than its factorization.

81577392347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104452569.

The product of its digits is 8890560, while the sum is 56.

The spelling of 81577392347 in words is "eighty-one billion, five hundred seventy-seven million, three hundred ninety-two thousand, three hundred forty-seven".