66650280 has 32 divisors (see below), whose sum is σ = 199951200. Its totient is φ = 17773376.

The previous prime is 66650261. The next prime is 66650291. The reversal of 66650280 is 8205666.

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, 277590 + ... + 277829.

It is an arithmetic number, because the mean of its divisors is an integer number (6248475).

Almost surely, 2^66650280 is an apocalyptic number.

66650280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66650280 is an abundant number, since it is smaller than the sum of its proper divisors (133300920).

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

66650280 is a wasteful number, since it uses less digits than its factorization.

66650280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555433 (or 555429 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 66650280 is about 8163.9622733082. The cubic root of 66650280 is about 405.4469079769.

The spelling of 66650280 in words is "sixty-six million, six hundred fifty thousand, two hundred eighty".