640148326823 has 2 divisors, whose sum is σ = 640148326824. Its totient is φ = 640148326822.

The previous prime is 640148326789. The next prime is 640148326841. The reversal of 640148326823 is 328623841046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640148326823 - 2¹⁸ = 640148064679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640148326723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320074163411 + 320074163412.

It is an arithmetic number, because the mean of its divisors is an integer number (320074163412).

Almost surely, 2^640148326823 is an apocalyptic number.

640148326823 is a deficient number, since it is larger than the sum of its proper divisors (1).

640148326823 is an equidigital number, since it uses as much as digits as its factorization.

640148326823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1327104, while the sum is 47.

The spelling of 640148326823 in words is "six hundred forty billion, one hundred forty-eight million, three hundred twenty-six thousand, eight hundred twenty-three".