664361553 has 8 divisors (see below), whose sum is σ = 900337216. Its totient is φ = 435646800.

The previous prime is 664361531. The next prime is 664361569. The reversal of 664361553 is 355163466.

It is a happy number.

664361553 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 664361553 - 2¹⁴ = 664345169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664361573) 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, 1815013 + ... + 1815378.

It is an arithmetic number, because the mean of its divisors is an integer number (112542152).

Almost surely, 2^664361553 is an apocalyptic number.

It is an amenable number.

664361553 is a deficient number, since it is larger than the sum of its proper divisors (235975663).

664361553 is a wasteful number, since it uses less digits than its factorization.

664361553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630455.

The product of its digits is 194400, while the sum is 39.

The square root of 664361553 is about 25775.2119874891. The cubic root of 664361553 is about 872.5724509147.

The spelling of 664361553 in words is "six hundred sixty-four million, three hundred sixty-one thousand, five hundred fifty-three".