80661604 has 6 divisors (see below), whose sum is σ = 141157814. Its totient is φ = 40330800.

The previous prime is 80661599. The next prime is 80661613. The reversal of 80661604 is 40616608.

It can be written as a sum of positive squares in only one way, i.e., 80460900 + 200704 = 8970^2 + 448^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082697 + ... + 10082704.

Almost surely, 2^80661604 is an apocalyptic number.

It is an amenable number.

80661604 is a deficient number, since it is larger than the sum of its proper divisors (60496210).

80661604 is a wasteful number, since it uses less digits than its factorization.

80661604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20165405 (or 20165403 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 80661604 is about 8981.1805460084. The cubic root of 80661604 is about 432.0714973684.

The spelling of 80661604 in words is "eighty million, six hundred sixty-one thousand, six hundred four".