660773875 has 8 divisors (see below), whose sum is σ = 824645952. Its totient is φ = 528619000.

The previous prime is 660773809. The next prime is 660773909. The reversal of 660773875 is 578377066.

It is not a de Polignac number, because 660773875 - 2¹³ = 660765683 is a prime.

It is a super-2 number, since 2×660773875² = 873244227765031250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2642971 + ... + 2643220.

It is an arithmetic number, because the mean of its divisors is an integer number (103080744).

Almost surely, 2^660773875 is an apocalyptic number.

660773875 is a deficient number, since it is larger than the sum of its proper divisors (163872077).

660773875 is an equidigital number, since it uses as much as digits as its factorization.

660773875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5286206 (or 5286196 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 49.

The square root of 660773875 is about 25705.5222666259. The cubic root of 660773875 is about 870.9989296637.

The spelling of 660773875 in words is "six hundred sixty million, seven hundred seventy-three thousand, eight hundred seventy-five".