667438717375 has 8 divisors (see below), whose sum is σ = 832963519440. Its totient is φ = 533950973800.

The previous prime is 667438717373. The next prime is 667438717381. The reversal of 667438717375 is 573717834766.

It is a happy number.

It is not a de Polignac number, because 667438717375 - 2¹ = 667438717373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667438717373) 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, 2669754745 + ... + 2669754994.

It is an arithmetic number, because the mean of its divisors is an integer number (104120439930).

Almost surely, 2^667438717375 is an apocalyptic number.

667438717375 is a deficient number, since it is larger than the sum of its proper divisors (165524802065).

667438717375 is an equidigital number, since it uses as much as digits as its factorization.

667438717375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5339509754 (or 5339509744 counting only the distinct ones).

The product of its digits is 124467840, while the sum is 64.

The spelling of 667438717375 in words is "six hundred sixty-seven billion, four hundred thirty-eight million, seven hundred seventeen thousand, three hundred seventy-five".