19463564993 has 2 divisors, whose sum is σ = 19463564994. Its totient is φ = 19463564992.

The previous prime is 19463564971. The next prime is 19463565007. The reversal of 19463564993 is 39946536491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15034928689 + 4428636304 = 122617^2 + 66548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19463564993 is a prime.

It is not a weakly prime, because it can be changed into another prime (19463564963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9731782496 + 9731782497.

It is an arithmetic number, because the mean of its divisors is an integer number (9731782497).

Almost surely, 2^19463564993 is an apocalyptic number.

It is an amenable number.

19463564993 is a deficient number, since it is larger than the sum of its proper divisors (1).

19463564993 is an equidigital number, since it uses as much as digits as its factorization.

19463564993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18895680, while the sum is 59.

The spelling of 19463564993 in words is "nineteen billion, four hundred sixty-three million, five hundred sixty-four thousand, nine hundred ninety-three".