19917366729 has 12 divisors (see below), whose sum is σ = 28756435536. Its totient is φ = 12256840752.

The previous prime is 19917366713. The next prime is 19917366739. The reversal of 19917366729 is 92766371991.

It is not a de Polignac number, because 19917366729 - 2⁴ = 19917366713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19917366709) 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 in 11 ways as a sum of consecutive naturals, for example, 19641867 + ... + 19642880.

It is an arithmetic number, because the mean of its divisors is an integer number (2396369628).

Almost surely, 2^19917366729 is an apocalyptic number.

It is an amenable number.

19917366729 is a deficient number, since it is larger than the sum of its proper divisors (8839068807).

19917366729 is a wasteful number, since it uses less digits than its factorization.

19917366729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39284776 (or 39284763 counting only the distinct ones).

The product of its digits is 7715736, while the sum is 60.

The spelling of 19917366729 in words is "nineteen billion, nine hundred seventeen million, three hundred sixty-six thousand, seven hundred twenty-nine".