667147664 has 10 divisors (see below), whose sum is σ = 1292598630. Its totient is φ = 333573824.

The previous prime is 667147661. The next prime is 667147669. The reversal of 667147664 is 466741766.

It can be written as a sum of positive squares in only one way, i.e., 649842064 + 17305600 = 25492^2 + 4160^2 .

It is not an unprimeable number, because it can be changed into a prime (667147661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20848349 + ... + 20848380.

It is an arithmetic number, because the mean of its divisors is an integer number (129259863).

Almost surely, 2^667147664 is an apocalyptic number.

It is an amenable number.

667147664 is a deficient number, since it is larger than the sum of its proper divisors (625450966).

667147664 is a wasteful number, since it uses less digits than its factorization.

667147664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41696737 (or 41696731 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 47.

The square root of 667147664 is about 25829.2017685410. The cubic root of 667147664 is about 873.7905091660.

The spelling of 667147664 in words is "six hundred sixty-seven million, one hundred forty-seven thousand, six hundred sixty-four".