649251018260 has 24 divisors (see below), whose sum is σ = 1468306149576. Its totient is φ = 239723452800.

The previous prime is 649251018257. The next prime is 649251018277. The reversal of 649251018260 is 62810152946.

It can be written as a sum of positive squares in 4 ways, for example, as 21172578064 + 628078440196 = 145508^2 + 792514^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1248559391 + ... + 1248559910.

It is an arithmetic number, because the mean of its divisors is an integer number (61179422899).

Almost surely, 2^649251018260 is an apocalyptic number.

It is an amenable number.

649251018260 is an abundant number, since it is smaller than the sum of its proper divisors (819055131316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649251018260 is a wasteful number, since it uses less digits than its factorization.

649251018260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497119323 (or 2497119321 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 649251018260 in words is "six hundred forty-nine billion, two hundred fifty-one million, eighteen thousand, two hundred sixty".