66677564 has 12 divisors (see below), whose sum is σ = 116823504. Its totient is φ = 33299424.

The previous prime is 66677561. The next prime is 66677579. The reversal of 66677564 is 46577666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66677561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5849 + ... + 12944.

It is an arithmetic number, because the mean of its divisors is an integer number (9735292).

Almost surely, 2^66677564 is an apocalyptic number.

It is an amenable number.

66677564 is a deficient number, since it is larger than the sum of its proper divisors (50145940).

66677564 is a wasteful number, since it uses less digits than its factorization.

66677564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19684 (or 19682 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 47.

The square root of 66677564 is about 8165.6331046649. The cubic root of 66677564 is about 405.5022250954.

The spelling of 66677564 in words is "sixty-six million, six hundred seventy-seven thousand, five hundred sixty-four".