664153730 has 8 divisors (see below), whose sum is σ = 1195476732. Its totient is φ = 265661488.

The previous prime is 664153717. The next prime is 664153733. The reversal of 664153730 is 37351466.

It can be written as a sum of positive squares in 2 ways, for example, as 582594769 + 81558961 = 24137^2 + 9031^2 .

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

It is a super-2 number, since 2×664153730² = 882200354145825800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664153733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33207677 + ... + 33207696.

Almost surely, 2^664153730 is an apocalyptic number.

664153730 is a deficient number, since it is larger than the sum of its proper divisors (531323002).

664153730 is a wasteful number, since it uses less digits than its factorization.

664153730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66415380.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 664153730 is about 25771.1802213248. The cubic root of 664153730 is about 872.4814565179.

The spelling of 664153730 in words is "six hundred sixty-four million, one hundred fifty-three thousand, seven hundred thirty".