81577692346 has 8 divisors (see below), whose sum is σ = 126586074420. Its totient is φ = 39382334208.

The previous prime is 81577692341. The next prime is 81577692377. The reversal of 81577692346 is 64329677518.

It can be written as a sum of positive squares in 2 ways, for example, as 70763980225 + 10813712121 = 266015^2 + 103989^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (58), and also a Moran number because the ratio is a prime number: 1406511937 = 81577692346 / (8 + 1 + 5 + 7 + 7 + 6 + 9 + 2 + 3 + 4 + 6).

It is not an unprimeable number, because it can be changed into a prime (81577692341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703255911 + ... + 703256026.

Almost surely, 2^81577692346 is an apocalyptic number.

81577692346 is a deficient number, since it is larger than the sum of its proper divisors (45008382074).

81577692346 is a wasteful number, since it uses less digits than its factorization.

81577692346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406511968.

The product of its digits is 15240960, while the sum is 58.

The spelling of 81577692346 in words is "eighty-one billion, five hundred seventy-seven million, six hundred ninety-two thousand, three hundred forty-six".