80866501 has 4 divisors (see below), whose sum is σ = 85623372. Its totient is φ = 76109632.

The previous prime is 80866493. The next prime is 80866519. The reversal of 80866501 is 10566808.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27196225 + 53670276 = 5215^2 + 7326^2 .

It is a cyclic number.

It is not a de Polignac number, because 80866501 - 2³ = 80866493 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 (80866561) 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, 2378410 + ... + 2378443.

It is an arithmetic number, because the mean of its divisors is an integer number (21405843).

Almost surely, 2^80866501 is an apocalyptic number.

It is an amenable number.

80866501 is a deficient number, since it is larger than the sum of its proper divisors (4756871).

80866501 is a wasteful number, since it uses less digits than its factorization.

80866501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4756870.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 80866501 is about 8992.5803304725. The cubic root of 80866501 is about 432.4370380687.

The spelling of 80866501 in words is "eighty million, eight hundred sixty-six thousand, five hundred one".