19642624691 has 2 divisors, whose sum is σ = 19642624692. Its totient is φ = 19642624690.

The previous prime is 19642624679. The next prime is 19642624711.

19642624691 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19642624691 is a prime.

It is not a weakly prime, because it can be changed into another prime (19642624591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9821312345 + 9821312346.

It is an arithmetic number, because the mean of its divisors is an integer number (9821312346).

Almost surely, 2^19642624691 is an apocalyptic number.

19642624691 is a deficient number, since it is larger than the sum of its proper divisors (1).

19642624691 is an equidigital number, since it uses as much as digits as its factorization.

19642624691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 50.

The spelling of 19642624691 in words is "nineteen billion, six hundred forty-two million, six hundred twenty-four thousand, six hundred ninety-one".