664843271345 has 64 divisors (see below), whose sum is σ = 899045941248. Its totient is φ = 467788032000.

The previous prime is 664843271321. The next prime is 664843271381. The reversal of 664843271345 is 543172348466.

It is not a de Polignac number, because 664843271345 - 2²⁸ = 664574835889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156321239 + ... + 156325491.

It is an arithmetic number, because the mean of its divisors is an integer number (14047592832).

Almost surely, 2^664843271345 is an apocalyptic number.

It is an amenable number.

664843271345 is a deficient number, since it is larger than the sum of its proper divisors (234202669903).

664843271345 is a wasteful number, since it uses less digits than its factorization.

664843271345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4874.

The product of its digits is 11612160, while the sum is 53.

The spelling of 664843271345 in words is "six hundred sixty-four billion, eight hundred forty-three million, two hundred seventy-one thousand, three hundred forty-five".