667565612556 has 24 divisors (see below), whose sum is σ = 1557957884784. Its totient is φ = 222478329600.

The previous prime is 667565612501. The next prime is 667565612563. The reversal of 667565612556 is 655216565766.

It is a self number, because there is not a number n which added to its sum of digits gives 667565612556.

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 7 ways as a sum of consecutive naturals, for example, 5378745 + ... + 5501456.

It is an arithmetic number, because the mean of its divisors is an integer number (64914911866).

Almost surely, 2^667565612556 is an apocalyptic number.

It is an amenable number.

667565612556 is an abundant number, since it is smaller than the sum of its proper divisors (890392272228).

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

667565612556 is a wasteful number, since it uses less digits than its factorization.

667565612556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10885321 (or 10885319 counting only the distinct ones).

The product of its digits is 68040000, while the sum is 60.

The spelling of 667565612556 in words is "six hundred sixty-seven billion, five hundred sixty-five million, six hundred twelve thousand, five hundred fifty-six".