666101275 has 48 divisors (see below), whose sum is σ = 998936064. Its totient is φ = 430721280.

The previous prime is 666101257. The next prime is 666101279. The reversal of 666101275 is 572101666.

It is a happy number.

It is not a de Polignac number, because 666101275 - 2⁵ = 666101243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666101275.

It is not an unprimeable number, because it can be changed into a prime (666101279) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 292692 + ... + 294958.

It is an arithmetic number, because the mean of its divisors is an integer number (20811168).

Almost surely, 2^666101275 is an apocalyptic number.

666101275 is a deficient number, since it is larger than the sum of its proper divisors (332834789).

666101275 is a wasteful number, since it uses less digits than its factorization.

666101275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2380 (or 2375 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 666101275 is about 25808.9378898086. The cubic root of 666101275 is about 873.3334373321. Note that the first 3 decimals are identical.

The spelling of 666101275 in words is "six hundred sixty-six million, one hundred one thousand, two hundred seventy-five".