640342611355 has 16 divisors (see below), whose sum is σ = 776137788000. Its totient is φ = 507124537600.

The previous prime is 640342611317. The next prime is 640342611481. The reversal of 640342611355 is 553116243046.

It is not a de Polignac number, because 640342611355 - 2¹¹ = 640342609307 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3329871 + ... + 3516919.

It is an arithmetic number, because the mean of its divisors is an integer number (48508611750).

Almost surely, 2^640342611355 is an apocalyptic number.

640342611355 is a deficient number, since it is larger than the sum of its proper divisors (135795176645).

640342611355 is a wasteful number, since it uses less digits than its factorization.

640342611355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193934.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 640342611355 in words is "six hundred forty billion, three hundred forty-two million, six hundred eleven thousand, three hundred fifty-five".