665707628025 has 96 divisors (see below), whose sum is σ = 1352896266240. Its totient is φ = 318221064000.

The previous prime is 665707628023. The next prime is 665707628057. The reversal of 665707628025 is 520826707566.

665707628025 is a `hidden beast` number, since 6 + 6 + 5 + 7 + 0 + 7 + 628 + 0 + 2 + 5 = 666.

It is not a de Polignac number, because 665707628025 - 2¹ = 665707628023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665707628023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 104217 + ... + 1158566.

It is an arithmetic number, because the mean of its divisors is an integer number (14092669440).

Almost surely, 2^665707628025 is an apocalyptic number.

It is an amenable number.

665707628025 is an abundant number, since it is smaller than the sum of its proper divisors (687188638215).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665707628025 is a wasteful number, since it uses less digits than its factorization.

665707628025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262884 (or 1262873 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 665707628025 in words is "six hundred sixty-five billion, seven hundred seven million, six hundred twenty-eight thousand, twenty-five".