664451601 has 8 divisors (see below), whose sum is σ = 966475104. Its totient is φ = 402697920.

The previous prime is 664451597. The next prime is 664451611. The reversal of 664451601 is 106154466.

It is a happy number.

664451601 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 664451601 - 2² = 664451597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 20134897 = 664451601 / (6 + 6 + 4 + 4 + 5 + 1 + 6 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (664451611) 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, 10067416 + ... + 10067481.

It is an arithmetic number, because the mean of its divisors is an integer number (120809388).

Almost surely, 2^664451601 is an apocalyptic number.

It is an amenable number.

664451601 is a deficient number, since it is larger than the sum of its proper divisors (302023503).

664451601 is a wasteful number, since it uses less digits than its factorization.

664451601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20134911.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 664451601 is about 25776.9587228595. The cubic root of 664451601 is about 872.6118721476.

The spelling of 664451601 in words is "six hundred sixty-four million, four hundred fifty-one thousand, six hundred one".