66697264 has 10 divisors (see below), whose sum is σ = 129225980. Its totient is φ = 33348624.

The previous prime is 66697261. The next prime is 66697291. The reversal of 66697264 is 46279666.

It is not an unprimeable number, because it can be changed into a prime (66697261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2084274 + ... + 2084305.

It is an arithmetic number, because the mean of its divisors is an integer number (12922598).

Almost surely, 2^66697264 is an apocalyptic number.

It is an amenable number.

66697264 is a deficient number, since it is larger than the sum of its proper divisors (62528716).

66697264 is a wasteful number, since it uses less digits than its factorization.

66697264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4168587 (or 4168581 counting only the distinct ones).

The product of its digits is 653184, while the sum is 46.

The square root of 66697264 is about 8166.8392906926. The cubic root of 66697264 is about 405.5421566044.

The spelling of 66697264 in words is "sixty-six million, six hundred ninety-seven thousand, two hundred sixty-four".