664365069 has 12 divisors (see below), whose sum is σ = 980056896. Its totient is φ = 433486152.

The previous prime is 664365047. The next prime is 664365071. The reversal of 664365069 is 960563466.

It is not a de Polignac number, because 664365069 - 2²⁷ = 530147341 is a prime.

It is a super-2 number, since 2×664365069² = 882761889814749522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664365019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 784879 + ... + 785724.

It is an arithmetic number, because the mean of its divisors is an integer number (81671408).

Almost surely, 2^664365069 is an apocalyptic number.

It is an amenable number.

664365069 is a deficient number, since it is larger than the sum of its proper divisors (315691827).

664365069 is a wasteful number, since it uses less digits than its factorization.

664365069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570656 (or 1570653 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The square root of 664365069 is about 25775.2801924635. The cubic root of 664365069 is about 872.5739902168.

The spelling of 664365069 in words is "six hundred sixty-four million, three hundred sixty-five thousand, sixty-nine".