666604617575 has 12 divisors (see below), whose sum is σ = 890173551288. Its totient is φ = 492261871200.

The previous prime is 666604617571. The next prime is 666604617599. The reversal of 666604617575 is 575716406666.

It is not a de Polignac number, because 666604617575 - 2² = 666604617571 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666604617571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1025545241 + ... + 1025545890.

It is an arithmetic number, because the mean of its divisors is an integer number (74181129274).

Almost surely, 2^666604617575 is an apocalyptic number.

666604617575 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

666604617575 is a deficient number, since it is larger than the sum of its proper divisors (223568933713).

666604617575 is a wasteful number, since it uses less digits than its factorization.

666604617575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051091154 (or 2051091149 counting only the distinct ones).

The product of its (nonzero) digits is 38102400, while the sum is 59.

The spelling of 666604617575 in words is "six hundred sixty-six billion, six hundred four million, six hundred seventeen thousand, five hundred seventy-five".