666065601 has 24 divisors (see below), whose sum is σ = 989501760. Its totient is φ = 431428896.

The previous prime is 666065567. The next prime is 666065629. The reversal of 666065601 is 106560666.

It is not a de Polignac number, because 666065601 - 2¹³ = 666057409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666061601) 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, 426460 + ... + 428018.

It is an arithmetic number, because the mean of its divisors is an integer number (41229240).

Almost surely, 2^666065601 is an apocalyptic number.

It is an amenable number.

666065601 is a deficient number, since it is larger than the sum of its proper divisors (323436159).

666065601 is a wasteful number, since it uses less digits than its factorization.

666065601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885 (or 2882 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 666065601 is about 25808.2467633894. The cubic root of 666065601 is about 873.3178461828.

Adding to 666065601 its product of nonzero digits (38880), we get a square (666104481 = 25809²).

It can be divided in two parts, 666065 and 601, that added together give a palindrome (666666).

The spelling of 666065601 in words is "six hundred sixty-six million, sixty-five thousand, six hundred one".