667400740128 has 36 divisors (see below), whose sum is σ = 1897920855558. Its totient is φ = 222466913280.

The previous prime is 667400740121. The next prime is 667400740129. The reversal of 667400740128 is 821047004766.

It can be written as a sum of positive squares in only one way, i.e., 399793173264 + 267607566864 = 632292^2 + 517308^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (667400740121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1158681553 + ... + 1158682128.

Almost surely, 2^667400740128 is an apocalyptic number.

It is an amenable number.

667400740128 is an abundant number, since it is smaller than the sum of its proper divisors (1230520115430).

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

667400740128 is a wasteful number, since it uses less digits than its factorization.

667400740128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317363697 (or 2317363686 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 667400740128 in words is "six hundred sixty-seven billion, four hundred million, seven hundred forty thousand, one hundred twenty-eight".