640507735514 has 8 divisors (see below), whose sum is σ = 960781559508. Its totient is φ = 320247215680.

The previous prime is 640507735477. The next prime is 640507735541. The reversal of 640507735514 is 415537705046.

640507735514 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 636831132289 + 3676603225 = 798017^2 + 60635^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3204797 + ... + 3398784.

Almost surely, 2^640507735514 is an apocalyptic number.

640507735514 is a deficient number, since it is larger than the sum of its proper divisors (320273823994).

640507735514 is a wasteful number, since it uses less digits than its factorization.

640507735514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6652080.

The product of its (nonzero) digits is 1764000, while the sum is 47.

The spelling of 640507735514 in words is "six hundred forty billion, five hundred seven million, seven hundred thirty-five thousand, five hundred fourteen".