640323356361 has 32 divisors (see below), whose sum is σ = 921715200000. Its totient is φ = 393070252608.

The previous prime is 640323356359. The next prime is 640323356363. The reversal of 640323356361 is 163653323046.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (640323356359) and next prime (640323356363).

It is not a de Polignac number, because 640323356361 - 2¹ = 640323356359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640323356363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49405000 + ... + 49417958.

It is an arithmetic number, because the mean of its divisors is an integer number (28803600000).

Almost surely, 2^640323356361 is an apocalyptic number.

It is an amenable number.

640323356361 is a deficient number, since it is larger than the sum of its proper divisors (281391843639).

640323356361 is a wasteful number, since it uses less digits than its factorization.

640323356361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16013.

The product of its (nonzero) digits is 699840, while the sum is 42.

The spelling of 640323356361 in words is "six hundred forty billion, three hundred twenty-three million, three hundred fifty-six thousand, three hundred sixty-one".