667178561425 has 12 divisors (see below), whose sum is σ = 827331226480. Its totient is φ = 533723616720.

The previous prime is 667178561417. The next prime is 667178561453. The reversal of 667178561425 is 524165871766.

It is not a de Polignac number, because 667178561425 - 2³ = 667178561417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667178561425.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 248566 + ... + 1181584.

Almost surely, 2^667178561425 is an apocalyptic number.

It is an amenable number.

667178561425 is a deficient number, since it is larger than the sum of its proper divisors (160152665055).

667178561425 is a wasteful number, since it uses less digits than its factorization.

667178561425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961632 (or 961627 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 58.

The spelling of 667178561425 in words is "six hundred sixty-seven billion, one hundred seventy-eight million, five hundred sixty-one thousand, four hundred twenty-five".