82731564661 has 4 divisors (see below), whose sum is σ = 83382994432. Its totient is φ = 82080134892.

The previous prime is 82731564607. The next prime is 82731564683. The reversal of 82731564661 is 16646513728.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82731564661 - 2⁷ = 82731564533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82731564161) 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, 325714695 + ... + 325714948.

It is an arithmetic number, because the mean of its divisors is an integer number (20845748608).

Almost surely, 2^82731564661 is an apocalyptic number.

It is an amenable number.

82731564661 is a deficient number, since it is larger than the sum of its proper divisors (651429771).

82731564661 is a wasteful number, since it uses less digits than its factorization.

82731564661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651429770.

The product of its digits is 1451520, while the sum is 49.

The spelling of 82731564661 in words is "eighty-two billion, seven hundred thirty-one million, five hundred sixty-four thousand, six hundred sixty-one".