667614126471440 has 40 divisors (see below), whose sum is σ = 1633897730578560. Its totient is φ = 252990616346496.

The previous prime is 667614126471361. The next prime is 667614126471449. The reversal of 667614126471440 is 44174621416766.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 667614126471440.

It is not an unprimeable number, because it can be changed into a prime (667614126471449) 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, 219609908504 + ... + 219609911543.

It is an arithmetic number, because the mean of its divisors is an integer number (40847443264464).

Almost surely, 2^{667614126471440} is an apocalyptic number.

It is an amenable number.

667614126471440 is an abundant number, since it is smaller than the sum of its proper divisors (966283604107120).

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

667614126471440 is a wasteful number, since it uses less digits than its factorization.

667614126471440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439219820079 (or 439219820073 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 59.

The spelling of 667614126471440 in words is "six hundred sixty-seven trillion, six hundred fourteen billion, one hundred twenty-six million, four hundred seventy-one thousand, four hundred forty".