66665268 has 120 divisors (see below), whose sum is σ = 183846432. Its totient is φ = 21041856.

The previous prime is 66665251. The next prime is 66665273. The reversal of 66665268 is 86256666.

Its product of digits (622080) is a multiple of the sum of its prime divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 803155 + ... + 803237.

Almost surely, 2^66665268 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 66665268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91923216).

66665268 is an abundant number, since it is smaller than the sum of its proper divisors (117181164).

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

66665268 is a wasteful number, since it uses less digits than its factorization.

66665268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 192 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 66665268 is about 8164.8801583367. The cubic root of 66665268 is about 405.4772973607.

The spelling of 66665268 in words is "sixty-six million, six hundred sixty-five thousand, two hundred sixty-eight".