82656561 has 8 divisors (see below), whose sum is σ = 118686400. Its totient is φ = 50865552.

The previous prime is 82656551. The next prime is 82656577. The reversal of 82656561 is 16565628.

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

It is not a de Polignac number, because 82656561 - 2⁵ = 82656529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 2119399 = 82656561 / (8 + 2 + 6 + 5 + 6 + 5 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82656551) 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, 1059661 + ... + 1059738.

It is an arithmetic number, because the mean of its divisors is an integer number (14835800).

Almost surely, 2^82656561 is an apocalyptic number.

It is an amenable number.

82656561 is a deficient number, since it is larger than the sum of its proper divisors (36029839).

82656561 is a wasteful number, since it uses less digits than its factorization.

82656561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119415.

The product of its digits is 86400, while the sum is 39.

The square root of 82656561 is about 9091.5653767654. The cubic root of 82656561 is about 435.6045867243.

The spelling of 82656561 in words is "eighty-two million, six hundred fifty-six thousand, five hundred sixty-one".