640131034250 has 16 divisors (see below), whose sum is σ = 1198325296584. Its totient is φ = 256052413600.

The previous prime is 640131034243. The next prime is 640131034307. The reversal of 640131034250 is 52430131046.

It can be written as a sum of positive squares in 4 ways, for example, as 133441898209 + 506689136041 = 365297^2 + 711821^2 .

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, 1280261819 + ... + 1280262318.

Almost surely, 2^640131034250 is an apocalyptic number.

640131034250 is a deficient number, since it is larger than the sum of its proper divisors (558194262334).

640131034250 is a wasteful number, since it uses less digits than its factorization.

640131034250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560524154 (or 2560524144 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 640131034250 its reverse (52430131046), we get a palindrome (692561165296).

The spelling of 640131034250 in words is "six hundred forty billion, one hundred thirty-one million, thirty-four thousand, two hundred fifty".