80521660 has 12 divisors (see below), whose sum is σ = 169095528. Its totient is φ = 32208656.

The previous prime is 80521633. The next prime is 80521687. The reversal of 80521660 is 6612508.

It is an interprime number because it is at equal distance from previous prime (80521633) and next prime (80521687).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2013022 + ... + 2013061.

It is an arithmetic number, because the mean of its divisors is an integer number (14091294).

Almost surely, 2^80521660 is an apocalyptic number.

It is an amenable number.

80521660 is an abundant number, since it is smaller than the sum of its proper divisors (88573868).

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

80521660 is a wasteful number, since it uses less digits than its factorization.

80521660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4026092 (or 4026090 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 80521660 is about 8973.3862058868. The cubic root of 80521660 is about 431.8214783061.

The spelling of 80521660 in words is "eighty million, five hundred twenty-one thousand, six hundred sixty".