640142863 has 2 divisors, whose sum is σ = 640142864. Its totient is φ = 640142862.

The previous prime is 640142821. The next prime is 640142917. The reversal of 640142863 is 368241046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640142863 - 2⁹ = 640142351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640142663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320071431 + 320071432.

It is an arithmetic number, because the mean of its divisors is an integer number (320071432).

Almost surely, 2^640142863 is an apocalyptic number.

640142863 is a deficient number, since it is larger than the sum of its proper divisors (1).

640142863 is an equidigital number, since it uses as much as digits as its factorization.

640142863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 640142863 is about 25301.0447017510. The cubic root of 640142863 is about 861.8379939511.

The spelling of 640142863 in words is "six hundred forty million, one hundred forty-two thousand, eight hundred sixty-three".