66475980 has 72 divisors (see below), whose sum is σ = 210424032. Its totient is φ = 16955136.

The previous prime is 66475973. The next prime is 66476017. The reversal of 66475980 is 8957466.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3889 + ... + 12168.

It is an arithmetic number, because the mean of its divisors is an integer number (2922556).

Almost surely, 2^66475980 is an apocalyptic number.

66475980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66475980 is an abundant number, since it is smaller than the sum of its proper divisors (143948052).

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

66475980 is a wasteful number, since it uses less digits than its factorization.

66475980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16095 (or 16090 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 66475980 is about 8153.2803214412. The cubic root of 66475980 is about 405.0931655809.

The spelling of 66475980 in words is "sixty-six million, four hundred seventy-five thousand, nine hundred eighty".