667438722456 has 32 divisors (see below), whose sum is σ = 1820287425600. Its totient is φ = 202254158240.

The previous prime is 667438722451. The next prime is 667438722463. The reversal of 667438722456 is 654227834766.

It is a self number, because there is not a number n which added to its sum of digits gives 667438722456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667438722451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1264088226 + ... + 1264088753.

It is an arithmetic number, because the mean of its divisors is an integer number (56883982050).

Almost surely, 2^667438722456 is an apocalyptic number.

667438722456 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

667438722456 is an abundant number, since it is smaller than the sum of its proper divisors (1152848703144).

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

667438722456 is a wasteful number, since it uses less digits than its factorization.

667438722456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528176999 (or 2528176995 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 60.

The spelling of 667438722456 in words is "six hundred sixty-seven billion, four hundred thirty-eight million, seven hundred twenty-two thousand, four hundred fifty-six".