649339318731 has 8 divisors (see below), whose sum is σ = 865793618320. Its totient is φ = 432888949152.

The previous prime is 649339318711. The next prime is 649339318759. The reversal of 649339318731 is 137813933946.

It is a happy number.

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

It is not a de Polignac number, because 649339318731 - 2⁹ = 649339318219 is a prime.

It is a super-2 number, since 2×649339318731² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649339318711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572536 + ... + 1275333.

It is an arithmetic number, because the mean of its divisors is an integer number (108224202290).

Almost surely, 2^649339318731 is an apocalyptic number.

649339318731 is a deficient number, since it is larger than the sum of its proper divisors (216454299589).

649339318731 is a wasteful number, since it uses less digits than its factorization.

649339318731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965005.

The product of its digits is 8817984, while the sum is 57.

The spelling of 649339318731 in words is "six hundred forty-nine billion, three hundred thirty-nine million, three hundred eighteen thousand, seven hundred thirty-one".