66418764 has 12 divisors (see below), whose sum is σ = 154977144. Its totient is φ = 22139584.

The previous prime is 66418763. The next prime is 66418777. The reversal of 66418764 is 46781466.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×66418764² = 8822904422575392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66418763) 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, 2767437 + ... + 2767460.

It is an arithmetic number, because the mean of its divisors is an integer number (12914762).

Almost surely, 2^66418764 is an apocalyptic number.

It is an amenable number.

66418764 is an abundant number, since it is smaller than the sum of its proper divisors (88558380).

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

66418764 is a wasteful number, since it uses less digits than its factorization.

66418764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5534904 (or 5534902 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 66418764 is about 8149.7707943230. The cubic root of 66418764 is about 404.9769107398.

The spelling of 66418764 in words is "sixty-six million, four hundred eighteen thousand, seven hundred sixty-four".