667438547744 has 24 divisors (see below), whose sum is σ = 1359330664860. Its totient is φ = 322211712256.

The previous prime is 667438547717. The next prime is 667438547749. The reversal of 667438547744 is 447745834766.

It can be written as a sum of positive squares in 2 ways, for example, as 648508090000 + 18930457744 = 805300^2 + 137588^2 .

It is not an unprimeable number, because it can be changed into a prime (667438547749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359610359 + ... + 359612214.

Almost surely, 2^667438547744 is an apocalyptic number.

It is an amenable number.

667438547744 is an abundant number, since it is smaller than the sum of its proper divisors (691892117116).

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

667438547744 is a wasteful number, since it uses less digits than its factorization.

667438547744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719222612 (or 719222604 counting only the distinct ones).

The product of its digits is 379330560, while the sum is 65.

The spelling of 667438547744 in words is "six hundred sixty-seven billion, four hundred thirty-eight million, five hundred forty-seven thousand, seven hundred forty-four".