80656561 has 8 divisors (see below), whose sum is σ = 84268800. Its totient is φ = 77053152.

The previous prime is 80656523. The next prime is 80656573. The reversal of 80656561 is 16565608.

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 80656561 - 2¹¹ = 80654513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80656561.

It is not an unprimeable number, because it can be changed into a prime (80656361) 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, 22456 + ... + 25798.

It is an arithmetic number, because the mean of its divisors is an integer number (10533600).

Almost surely, 2^80656561 is an apocalyptic number.

It is an amenable number.

80656561 is a deficient number, since it is larger than the sum of its proper divisors (3612239).

80656561 is a wasteful number, since it uses less digits than its factorization.

80656561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4415.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 80656561 is about 8980.8997878832. The cubic root of 80656561 is about 432.0624927455.

The spelling of 80656561 in words is "eighty million, six hundred fifty-six thousand, five hundred sixty-one".