66254664 has 96 divisors (see below), whose sum is σ = 196499520. Its totient is φ = 18555264.

The previous prime is 66254663. The next prime is 66254681. The reversal of 66254664 is 46645266.

It is not an unprimeable number, because it can be changed into a prime (66254663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61797 + ... + 62859.

It is an arithmetic number, because the mean of its divisors is an integer number (2046870).

Almost surely, 2^66254664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66254664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98249760).

66254664 is an abundant number, since it is smaller than the sum of its proper divisors (130244856).

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

66254664 is a wasteful number, since it uses less digits than its factorization.

66254664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139 (or 1128 counting only the distinct ones).

The product of its digits is 207360, while the sum is 39.

The square root of 66254664 is about 8139.6968002500. The cubic root of 66254664 is about 404.6431119077.

The spelling of 66254664 in words is "sixty-six million, two hundred fifty-four thousand, six hundred sixty-four".