666744075 has 48 divisors (see below), whose sum is σ = 1267106400. Its totient is φ = 343324800.

The previous prime is 666744049. The next prime is 666744077. The reversal of 666744075 is 570447666.

It is a happy number.

It is not a de Polignac number, because 666744075 - 2⁹ = 666743563 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 666744075.

It is not an unprimeable number, because it can be changed into a prime (666744077) 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, 2545 + ... + 36605.

It is an arithmetic number, because the mean of its divisors is an integer number (26398050).

Almost surely, 2^666744075 is an apocalyptic number.

666744075 is a deficient number, since it is larger than the sum of its proper divisors (600362325).

666744075 is a wasteful number, since it uses less digits than its factorization.

666744075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34109 (or 34098 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The square root of 666744075 is about 25821.3879371346. The cubic root of 666744075 is about 873.6142746317.

The spelling of 666744075 in words is "six hundred sixty-six million, seven hundred forty-four thousand, seventy-five".