80817659 has 12 divisors (see below), whose sum is σ = 92122200. Its totient is φ = 70671744.

The previous prime is 80817641. The next prime is 80817661. The reversal of 80817659 is 95671808.

80817659 = 132² + 133² + ... + 625².

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-80817659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80817689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9374 + ... + 15795.

It is an arithmetic number, because the mean of its divisors is an integer number (7676850).

Almost surely, 2^80817659 is an apocalyptic number.

80817659 is a deficient number, since it is larger than the sum of its proper divisors (11304541).

80817659 is a wasteful number, since it uses less digits than its factorization.

80817659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25214 (or 25201 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 80817659 is about 8989.8642370172. The cubic root of 80817659 is about 432.3499589805.

The spelling of 80817659 in words is "eighty million, eight hundred seventeen thousand, six hundred fifty-nine".