664415765 has 8 divisors (see below), whose sum is σ = 858629688. Its totient is φ = 490645440.

The previous prime is 664415753. The next prime is 664415803. The reversal of 664415765 is 567514466.

664415765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 35509681 + 628906084 = 5959^2 + 25078^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664415765 - 2⁴ = 664415749 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 7 ways as a sum of consecutive naturals, for example, 5110826 + ... + 5110955.

It is an arithmetic number, because the mean of its divisors is an integer number (107328711).

Almost surely, 2^664415765 is an apocalyptic number.

664415765 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

664415765 is a deficient number, since it is larger than the sum of its proper divisors (194213923).

664415765 is a wasteful number, since it uses less digits than its factorization.

664415765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10221799.

The product of its digits is 604800, while the sum is 44.

The square root of 664415765 is about 25776.2635965727. The cubic root of 664415765 is about 872.5961842825.

The spelling of 664415765 in words is "six hundred sixty-four million, four hundred fifteen thousand, seven hundred sixty-five".