664470365 has 16 divisors (see below), whose sum is σ = 860288688. Its totient is φ = 489778176.

The previous prime is 664470311. The next prime is 664470419. The reversal of 664470365 is 563074466.

It is an interprime number because it is at equal distance from previous prime (664470311) and next prime (664470419).

It can be written as a sum of positive squares in 8 ways, for example, as 357134404 + 307335961 = 18898^2 + 17531^2 .

It is a cyclic number.

It is not a de Polignac number, because 664470365 - 2²⁰ = 663421789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27029 + ... + 45381.

It is an arithmetic number, because the mean of its divisors is an integer number (53768043).

Almost surely, 2^664470365 is an apocalyptic number.

664470365 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

664470365 is a deficient number, since it is larger than the sum of its proper divisors (195818323).

664470365 is a wasteful number, since it uses less digits than its factorization.

664470365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18928.

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 664470365 is about 25777.3226887511. The cubic root of 664470365 is about 872.6200862071.

The spelling of 664470365 in words is "six hundred sixty-four million, four hundred seventy thousand, three hundred sixty-five".