664521465 has 8 divisors (see below), whose sum is σ = 1063234368. Its totient is φ = 354411440.

The previous prime is 664521461. The next prime is 664521479. The reversal of 664521465 is 564125466.

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

It is not a de Polignac number, because 664521465 - 2² = 664521461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664521461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22150701 + ... + 22150730.

It is an arithmetic number, because the mean of its divisors is an integer number (132904296).

Almost surely, 2^664521465 is an apocalyptic number.

It is an amenable number.

664521465 is a deficient number, since it is larger than the sum of its proper divisors (398712903).

664521465 is a wasteful number, since it uses less digits than its factorization.

664521465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44301439.

The product of its digits is 172800, while the sum is 39.

The square root of 664521465 is about 25778.3138509872. The cubic root of 664521465 is about 872.6424547710.

The spelling of 664521465 in words is "six hundred sixty-four million, five hundred twenty-one thousand, four hundred sixty-five".