640246880363 has 16 divisors (see below), whose sum is σ = 664680038400. Its totient is φ = 616059179040.

The previous prime is 640246880347. The next prime is 640246880381. The reversal of 640246880363 is 363088642046.

It is a cyclic number.

It is not a de Polignac number, because 640246880363 - 2⁴ = 640246880347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640246880333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4118198 + ... + 4270836.

It is an arithmetic number, because the mean of its divisors is an integer number (41542502400).

Almost surely, 2^640246880363 is an apocalyptic number.

640246880363 is a deficient number, since it is larger than the sum of its proper divisors (24433158037).

640246880363 is a wasteful number, since it uses less digits than its factorization.

640246880363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153442.

The product of its (nonzero) digits is 3981312, while the sum is 50.

The spelling of 640246880363 in words is "six hundred forty billion, two hundred forty-six million, eight hundred eighty thousand, three hundred sixty-three".