664425515 has 8 divisors (see below), whose sum is σ = 858642288. Its totient is φ = 490652640.

The previous prime is 664425469. The next prime is 664425529. The reversal of 664425515 is 515524466.

664425515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 664425515 - 2¹⁰ = 664424491 is a prime.

It is a super-2 number, since 2×664425515² = 882922529966030450, which contains 22 as substring.

It is a Duffinian 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, 5110901 + ... + 5111030.

It is an arithmetic number, because the mean of its divisors is an integer number (107330286).

Almost surely, 2^664425515 is an apocalyptic number.

664425515 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

664425515 is a deficient number, since it is larger than the sum of its proper divisors (194216773).

664425515 is a wasteful number, since it uses less digits than its factorization.

664425515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10221949.

The product of its digits is 144000, while the sum is 38.

The square root of 664425515 is about 25776.4527233675. The cubic root of 664425515 is about 872.6004525793.

The spelling of 664425515 in words is "six hundred sixty-four million, four hundred twenty-five thousand, five hundred fifteen".