66121168 has 20 divisors (see below), whose sum is σ = 128831040. Its totient is φ = 32874464.

The previous prime is 66121127. The next prime is 66121169. The reversal of 66121168 is 86112166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66121169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8680 + ... + 14407.

It is an arithmetic number, because the mean of its divisors is an integer number (6441552).

Almost surely, 2^66121168 is an apocalyptic number.

It is an amenable number.

66121168 is a deficient number, since it is larger than the sum of its proper divisors (62709872).

66121168 is a wasteful number, since it uses less digits than its factorization.

66121168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23274 (or 23268 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 66121168 is about 8131.4923599546. The cubic root of 66121168 is about 404.3711584352.

The spelling of 66121168 in words is "sixty-six million, one hundred twenty-one thousand, one hundred sixty-eight".