667724225838 has 16 divisors (see below), whose sum is σ = 1343167808976. Its totient is φ = 221288182400.

The previous prime is 667724225801. The next prime is 667724225843. The reversal of 667724225838 is 838522427766.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321638763 + ... + 321640838.

It is an arithmetic number, because the mean of its divisors is an integer number (83947988061).

Almost surely, 2^667724225838 is an apocalyptic number.

667724225838 is an abundant number, since it is smaller than the sum of its proper divisors (675443583138).

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

667724225838 is a wasteful number, since it uses less digits than its factorization.

667724225838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643279779.

The product of its digits is 54190080, while the sum is 60.

The spelling of 667724225838 in words is "six hundred sixty-seven billion, seven hundred twenty-four million, two hundred twenty-five thousand, eight hundred thirty-eight".