664625251 has 8 divisors (see below), whose sum is σ = 704763504. Its totient is φ = 624602880.

The previous prime is 664625233. The next prime is 664625281. The reversal of 664625251 is 152526466.

664625251 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 a cyclic number.

It is not a de Polignac number, because 664625251 - 2²¹ = 662528099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664625251.

It is not an unprimeable number, because it can be changed into a prime (664625281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17010 + ... + 40231.

It is an arithmetic number, because the mean of its divisors is an integer number (88095438).

Almost surely, 2^664625251 is an apocalyptic number.

664625251 is a deficient number, since it is larger than the sum of its proper divisors (40138253).

664625251 is a wasteful number, since it uses less digits than its factorization.

664625251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57941.

The product of its digits is 86400, while the sum is 37.

The square root of 664625251 is about 25780.3268210471. The cubic root of 664625251 is about 872.6878826264.

The spelling of 664625251 in words is "six hundred sixty-four million, six hundred twenty-five thousand, two hundred fifty-one".