66764675 has 12 divisors (see below), whose sum is σ = 84551136. Its totient is φ = 52274400.

The previous prime is 66764671. The next prime is 66764693. The reversal of 66764675 is 57646766.

It is not a de Polignac number, because 66764675 - 2² = 66764671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66764671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27236 + ... + 29585.

It is an arithmetic number, because the mean of its divisors is an integer number (7045928).

Almost surely, 2^66764675 is an apocalyptic number.

66764675 is a deficient number, since it is larger than the sum of its proper divisors (17786461).

66764675 is a wasteful number, since it uses less digits than its factorization.

66764675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56878 (or 56873 counting only the distinct ones).

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

The square root of 66764675 is about 8170.9653652430. The cubic root of 66764675 is about 405.6787379055.

The spelling of 66764675 in words is "sixty-six million, seven hundred sixty-four thousand, six hundred seventy-five".