19640944903 has 2 divisors, whose sum is σ = 19640944904. Its totient is φ = 19640944902.

The previous prime is 19640944861. The next prime is 19640944907. The reversal of 19640944903 is 30944904691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19640944903 - 2¹⁷ = 19640813831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19640944907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9820472451 + 9820472452.

It is an arithmetic number, because the mean of its divisors is an integer number (9820472452).

Almost surely, 2^19640944903 is an apocalyptic number.

19640944903 is a deficient number, since it is larger than the sum of its proper divisors (1).

19640944903 is an equidigital number, since it uses as much as digits as its factorization.

19640944903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 49.

The spelling of 19640944903 in words is "nineteen billion, six hundred forty million, nine hundred forty-four thousand, nine hundred three".