665355250725 has 72 divisors (see below), whose sum is σ = 1212743837760. Its totient is φ = 321637747200.

The previous prime is 665355250709. The next prime is 665355250783. The reversal of 665355250725 is 527052553566.

It is a happy number.

It is not a de Polignac number, because 665355250725 - 2⁴ = 665355250709 is a prime.

It is a super-2 number, since 2×665355250725² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2949496 + ... + 3167054.

Almost surely, 2^665355250725 is an apocalyptic number.

It is an amenable number.

665355250725 is a deficient number, since it is larger than the sum of its proper divisors (547388587035).

665355250725 is a wasteful number, since it uses less digits than its factorization.

665355250725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217931 (or 217915 counting only the distinct ones).

The product of its (nonzero) digits is 9450000, while the sum is 51.

The spelling of 665355250725 in words is "six hundred sixty-five billion, three hundred fifty-five million, two hundred fifty thousand, seven hundred twenty-five".