66660375 has 16 divisors (see below), whose sum is σ = 110923488. Its totient is φ = 35552000.

The previous prime is 66660361. The next prime is 66660389. The reversal of 66660375 is 57306666.

It is an interprime number because it is at equal distance from previous prime (66660361) and next prime (66660389).

It is not a de Polignac number, because 66660375 - 2⁵ = 66660343 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88506 + ... + 89255.

It is an arithmetic number, because the mean of its divisors is an integer number (6932718).

Almost surely, 2^66660375 is an apocalyptic number.

66660375 is a deficient number, since it is larger than the sum of its proper divisors (44263113).

66660375 is a wasteful number, since it uses less digits than its factorization.

66660375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177779 (or 177769 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 39.

The square root of 66660375 is about 8164.5805158624. The cubic root of 66660375 is about 405.4673769077.

The spelling of 66660375 in words is "sixty-six million, six hundred sixty thousand, three hundred seventy-five".