640989799514 has 8 divisors (see below), whose sum is σ = 1003288381920. Its totient is φ = 306560338876.

The previous prime is 640989799507. The next prime is 640989799543. The reversal of 640989799514 is 415997989046.

640989799514 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

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, 6967280384 + ... + 6967280475.

It is an arithmetic number, because the mean of its divisors is an integer number (125411047740).

Almost surely, 2^640989799514 is an apocalyptic number.

640989799514 is a deficient number, since it is larger than the sum of its proper divisors (362298582406).

640989799514 is a wasteful number, since it uses less digits than its factorization.

640989799514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13934560884.

The product of its (nonzero) digits is 176359680, while the sum is 71.

The spelling of 640989799514 in words is "six hundred forty billion, nine hundred eighty-nine million, seven hundred ninety-nine thousand, five hundred fourteen".