664172770 has 8 divisors (see below), whose sum is σ = 1195511004. Its totient is φ = 265669104.

The previous prime is 664172753. The next prime is 664172783. The reversal of 664172770 is 77271466.

It can be written as a sum of positive squares in 2 ways, for example, as 576432081 + 87740689 = 24009^2 + 9367^2 .

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

It is a super-2 number, since 2×664172770² = 882250936818945800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33208629 + ... + 33208648.

Almost surely, 2^664172770 is an apocalyptic number.

664172770 is a deficient number, since it is larger than the sum of its proper divisors (531338234).

664172770 is a wasteful number, since it uses less digits than its factorization.

664172770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66417284.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 664172770 is about 25771.5496235675. The cubic root of 664172770 is about 872.4897938889.

The spelling of 664172770 in words is "six hundred sixty-four million, one hundred seventy-two thousand, seven hundred seventy".