66980080 has 40 divisors (see below), whose sum is σ = 156240000. Its totient is φ = 26704128.

The previous prime is 66980063. The next prime is 66980099. The reversal of 66980080 is 8008966.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×66980080² = 8972662233612800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26721 + ... + 29119.

It is an arithmetic number, because the mean of its divisors is an integer number (3906000).

Almost surely, 2^66980080 is an apocalyptic number.

It is an amenable number.

66980080 is an abundant number, since it is smaller than the sum of its proper divisors (89259920).

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

66980080 is a wasteful number, since it uses less digits than its factorization.

66980080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2761 (or 2755 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 66980080 is about 8184.1358737499. The cubic root of 66980080 is about 406.1145542945.

The spelling of 66980080 in words is "sixty-six million, nine hundred eighty thousand, eighty".