664843601247 has 16 divisors (see below), whose sum is σ = 1024478104320. Its totient is φ = 375641969472.

The previous prime is 664843601237. The next prime is 664843601251. The reversal of 664843601247 is 742106348466.

It is not a de Polignac number, because 664843601247 - 2⁸ = 664843600991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664843601247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664843601237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177858913 + ... + 177862650.

It is an arithmetic number, because the mean of its divisors is an integer number (64029881520).

Almost surely, 2^664843601247 is an apocalyptic number.

664843601247 is a deficient number, since it is larger than the sum of its proper divisors (359634503073).

664843601247 is a wasteful number, since it uses less digits than its factorization.

664843601247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355721662.

The product of its (nonzero) digits is 4644864, while the sum is 51.

The spelling of 664843601247 in words is "six hundred sixty-four billion, eight hundred forty-three million, six hundred one thousand, two hundred forty-seven".