667788525 has 72 divisors (see below), whose sum is σ = 1234920960. Its totient is φ = 344736000.

The previous prime is 667788521. The next prime is 667788547. The reversal of 667788525 is 525887766.

It is not a de Polignac number, because 667788525 - 2² = 667788521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667788521) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1761786 + ... + 1762164.

It is an arithmetic number, because the mean of its divisors is an integer number (17151680).

Almost surely, 2^667788525 is an apocalyptic number.

It is an amenable number.

667788525 is a deficient number, since it is larger than the sum of its proper divisors (567132435).

667788525 is a wasteful number, since it uses less digits than its factorization.

667788525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 619 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The square root of 667788525 is about 25841.6045360964. The cubic root of 667788525 is about 874.0702068904.

The spelling of 667788525 in words is "six hundred sixty-seven million, seven hundred eighty-eight thousand, five hundred twenty-five".