640617387349 has 8 divisors (see below), whose sum is σ = 643983480000. Its totient is φ = 637252764192.

The previous prime is 640617387337. The next prime is 640617387379. The reversal of 640617387349 is 943783716046.

640617387349 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 cyclic number.

It is not a de Polignac number, because 640617387349 - 2³⁹ = 90861573461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640617387293 and 640617387302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640617387329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512322 + ... + 1242460.

It is an arithmetic number, because the mean of its divisors is an integer number (80497935000).

Almost surely, 2^640617387349 is an apocalyptic number.

It is an amenable number.

640617387349 is a deficient number, since it is larger than the sum of its proper divisors (3366092651).

640617387349 is a wasteful number, since it uses less digits than its factorization.

640617387349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734747.

The product of its (nonzero) digits is 18289152, while the sum is 58.

The spelling of 640617387349 in words is "six hundred forty billion, six hundred seventeen million, three hundred eighty-seven thousand, three hundred forty-nine".