66158980 has 24 divisors (see below), whose sum is σ = 139872600. Its totient is φ = 26285984.

The previous prime is 66158941. The next prime is 66158993. The reversal of 66158980 is 8985166.

It can be written as a sum of positive squares in 4 ways, for example, as 29095236 + 37063744 = 5394^2 + 6088^2 .

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 7 ways as a sum of consecutive naturals, for example, 443946 + ... + 444094.

It is an arithmetic number, because the mean of its divisors is an integer number (5828025).

Almost surely, 2^66158980 is an apocalyptic number.

It is an amenable number.

66158980 is an abundant number, since it is smaller than the sum of its proper divisors (73713620).

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

66158980 is an frugal number, since it uses more digits than its factorization.

66158980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 66158980 is about 8133.8170621179. The cubic root of 66158980 is about 404.4482248726.

The spelling of 66158980 in words is "sixty-six million, one hundred fifty-eight thousand, nine hundred eighty".