664961834 has 24 divisors (see below), whose sum is σ = 1069048908. Its totient is φ = 310123520.

The previous prime is 664961833. The next prime is 664961837. The reversal of 664961834 is 438169466.

It can be written as a sum of positive squares in 6 ways, for example, as 344659225 + 320302609 = 18565^2 + 17897^2 .

It is not an unprimeable number, because it can be changed into a prime (664961831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60224 + ... + 70404.

Almost surely, 2^664961834 is an apocalyptic number.

664961834 is a deficient number, since it is larger than the sum of its proper divisors (404087074).

664961834 is a wasteful number, since it uses less digits than its factorization.

664961834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10330 (or 10313 counting only the distinct ones).

The product of its digits is 746496, while the sum is 47.

The square root of 664961834 is about 25786.8538988377. The cubic root of 664961834 is about 872.8351748209.

The spelling of 664961834 in words is "six hundred sixty-four million, nine hundred sixty-one thousand, eight hundred thirty-four".