80666664 has 64 divisors (see below), whose sum is σ = 221840640. Its totient is φ = 24288000.

The previous prime is 80666653. The next prime is 80666671. The reversal of 80666664 is 46666608.

It is a super-2 number, since 2×80666664² = 13014221361777792, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11914 + ... + 17414.

It is an arithmetic number, because the mean of its divisors is an integer number (3466260).

Almost surely, 2^80666664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80666664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110920320).

80666664 is an abundant number, since it is smaller than the sum of its proper divisors (141173976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80666664 is a wasteful number, since it uses less digits than its factorization.

80666664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5570 (or 5566 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 80666664 is about 8981.4622417511. The cubic root of 80666664 is about 432.0805319687.

The spelling of 80666664 in words is "eighty million, six hundred sixty-six thousand, six hundred sixty-four".