667765725 has 36 divisors (see below), whose sum is σ = 1213547328. Its totient is φ = 323760800.

The previous prime is 667765669. The next prime is 667765727. The reversal of 667765725 is 527567766.

It is not a de Polignac number, because 667765725 - 2⁹ = 667765213 is a prime.

It is a super-2 number, since 2×667765725² = 891822126969551250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667765727) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 27717 + ... + 45866.

It is an arithmetic number, because the mean of its divisors is an integer number (33709648).

Almost surely, 2^667765725 is an apocalyptic number.

It is an amenable number.

667765725 is a deficient number, since it is larger than the sum of its proper divisors (545781603).

667765725 is a wasteful number, since it uses less digits than its factorization.

667765725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73618 (or 73602 counting only the distinct ones).

The product of its digits is 3704400, while the sum is 51.

The square root of 667765725 is about 25841.1633832535. The cubic root of 667765725 is about 874.0602591166.

The spelling of 667765725 in words is "six hundred sixty-seven million, seven hundred sixty-five thousand, seven hundred twenty-five".