664896837 has 16 divisors (see below), whose sum is σ = 976703040. Its totient is φ = 398976000.

The previous prime is 664896781. The next prime is 664896853. The reversal of 664896837 is 738698466.

It is a happy number.

It is not a de Polignac number, because 664896837 - 2⁷ = 664896709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664896437) 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 15 ways as a sum of consecutive naturals, for example, 96412 + ... + 103077.

It is an arithmetic number, because the mean of its divisors is an integer number (61043940).

Almost surely, 2^664896837 is an apocalyptic number.

It is an amenable number.

664896837 is a deficient number, since it is larger than the sum of its proper divisors (311806203).

664896837 is a wasteful number, since it uses less digits than its factorization.

664896837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199604.

The product of its digits is 10450944, while the sum is 57.

The square root of 664896837 is about 25785.5935940982. The cubic root of 664896837 is about 872.8067353359.

The spelling of 664896837 in words is "six hundred sixty-four million, eight hundred ninety-six thousand, eight hundred thirty-seven".