640163451223 has 2 divisors, whose sum is σ = 640163451224. Its totient is φ = 640163451222.

The previous prime is 640163451209. The next prime is 640163451269. The reversal of 640163451223 is 322154361046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640163451223 - 2⁹ = 640163450711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640163451283) 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 as a sum of consecutive naturals, namely, 320081725611 + 320081725612.

It is an arithmetic number, because the mean of its divisors is an integer number (320081725612).

Almost surely, 2^640163451223 is an apocalyptic number.

640163451223 is a deficient number, since it is larger than the sum of its proper divisors (1).

640163451223 is an equidigital number, since it uses as much as digits as its factorization.

640163451223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 640163451223 in words is "six hundred forty billion, one hundred sixty-three million, four hundred fifty-one thousand, two hundred twenty-three".