66164660 has 24 divisors (see below), whose sum is σ = 143738280. Its totient is φ = 25553024.

The previous prime is 66164653. The next prime is 66164671. The reversal of 66164660 is 6646166.

It can be written as a sum of positive squares in 4 ways, for example, as 2704 + 66161956 = 52^2 + 8134^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66164660.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56459 + ... + 57618.

It is an arithmetic number, because the mean of its divisors is an integer number (5989095).

Almost surely, 2^66164660 is an apocalyptic number.

It is an amenable number.

66164660 is an abundant number, since it is smaller than the sum of its proper divisors (77573620).

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

66164660 is a wasteful number, since it uses less digits than its factorization.

66164660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114115 (or 114113 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 66164660 is about 8134.1662141857. The cubic root of 66164660 is about 404.4597990141.

The spelling of 66164660 in words is "sixty-six million, one hundred sixty-four thousand, six hundred sixty".