664441134464452 has 24 divisors (see below), whose sum is σ = 1231562805218424. Its totient is φ = 312578506555392.

The previous prime is 664441134464389. The next prime is 664441134464467. The reversal of 664441134464452 is 254464431144466.

It can be written as a sum of positive squares in 4 ways, for example, as 418708422317956 + 245732712146496 = 20462366^2 + 15675864^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1557197133 + ... + 1557623764.

It is an arithmetic number, because the mean of its divisors is an integer number (51315116884101).

Almost surely, 2^{664441134464452} is an apocalyptic number.

It is an amenable number.

664441134464452 is a deficient number, since it is larger than the sum of its proper divisors (567121670753972).

664441134464452 is a wasteful number, since it uses less digits than its factorization.

664441134464452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3114824055 (or 3114824053 counting only the distinct ones).

The product of its digits is 106168320, while the sum is 58.

The spelling of 664441134464452 in words is "six hundred sixty-four trillion, four hundred forty-one billion, one hundred thirty-four million, four hundred sixty-four thousand, four hundred fifty-two".