664680445 has 16 divisors (see below), whose sum is σ = 937060992. Its totient is φ = 446218560.

The previous prime is 664680437. The next prime is 664680449. The reversal of 664680445 is 544086466.

It is not a de Polignac number, because 664680445 - 2³ = 664680437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664680449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464097 + ... + 465526.

It is an arithmetic number, because the mean of its divisors is an integer number (58566312).

Almost surely, 2^664680445 is an apocalyptic number.

664680445 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

664680445 is a deficient number, since it is larger than the sum of its proper divisors (272380547).

664680445 is a wasteful number, since it uses less digits than its factorization.

664680445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929652.

The product of its (nonzero) digits is 552960, while the sum is 43.

The square root of 664680445 is about 25781.3972662461. The cubic root of 664680445 is about 872.7120394986.

The spelling of 664680445 in words is "six hundred sixty-four million, six hundred eighty thousand, four hundred forty-five".