66237664 has 24 divisors (see below), whose sum is σ = 133183008. Its totient is φ = 32413440.

The previous prime is 66237649. The next prime is 66237671. The reversal of 66237664 is 46673266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20517 + ... + 23524.

It is an arithmetic number, because the mean of its divisors is an integer number (5549292).

Almost surely, 2^66237664 is an apocalyptic number.

It is an amenable number.

66237664 is an abundant number, since it is smaller than the sum of its proper divisors (66945344).

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

66237664 is a wasteful number, since it uses less digits than its factorization.

66237664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44098 (or 44090 counting only the distinct ones).

The product of its digits is 217728, while the sum is 40.

The square root of 66237664 is about 8138.6524683144. The cubic root of 66237664 is about 404.6085004006.

The spelling of 66237664 in words is "sixty-six million, two hundred thirty-seven thousand, six hundred sixty-four".