66168840 has 32 divisors (see below), whose sum is σ = 198506880. Its totient is φ = 17644992.

The previous prime is 66168833. The next prime is 66168877. The reversal of 66168840 is 4886166.

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, 275584 + ... + 275823.

It is an arithmetic number, because the mean of its divisors is an integer number (6203340).

Almost surely, 2^66168840 is an apocalyptic number.

66168840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66168840 is an abundant number, since it is smaller than the sum of its proper divisors (132338040).

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

66168840 is a wasteful number, since it uses less digits than its factorization.

66168840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551421 (or 551417 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 66168840 is about 8134.4231510292. The cubic root of 66168840 is about 404.4683161810.

The spelling of 66168840 in words is "sixty-six million, one hundred sixty-eight thousand, eight hundred forty".