66745670 has 16 divisors (see below), whose sum is σ = 126465840. Its totient is φ = 25293024.

The previous prime is 66745667. The next prime is 66745681. The reversal of 66745670 is 7654766.

It is a Curzon number.

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, 175457 + ... + 175836.

It is an arithmetic number, because the mean of its divisors is an integer number (7904115).

Almost surely, 2^66745670 is an apocalyptic number.

66745670 is a deficient number, since it is larger than the sum of its proper divisors (59720170).

66745670 is a wasteful number, since it uses less digits than its factorization.

66745670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351319.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 66745670 is about 8169.8023231900. The cubic root of 66745670 is about 405.6402412200.

The spelling of 66745670 in words is "sixty-six million, seven hundred forty-five thousand, six hundred seventy".