66554164 has 12 divisors (see below), whose sum is σ = 116527684. Its totient is φ = 33260544.

The previous prime is 66554161. The next prime is 66554177. The reversal of 66554164 is 46145566.

It can be written as a sum of positive squares in 2 ways, for example, as 20178064 + 46376100 = 4492^2 + 6810^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66554161) 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, 11422 + ... + 16234.

Almost surely, 2^66554164 is an apocalyptic number.

It is an amenable number.

66554164 is a deficient number, since it is larger than the sum of its proper divisors (49973520).

66554164 is a wasteful number, since it uses less digits than its factorization.

66554164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8274 (or 8272 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 66554164 is about 8158.0735471066. The cubic root of 66554164 is about 405.2519166340.

The spelling of 66554164 in words is "sixty-six million, five hundred fifty-four thousand, one hundred sixty-four".