19642691359 has 4 divisors (see below), whose sum is σ = 20676517240. Its totient is φ = 18608865480.

The previous prime is 19642691339. The next prime is 19642691371. The reversal of 19642691359 is 95319624691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19642691359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19642691339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 516912912 + ... + 516912949.

It is an arithmetic number, because the mean of its divisors is an integer number (5169129310).

Almost surely, 2^19642691359 is an apocalyptic number.

19642691359 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19642691359 is a deficient number, since it is larger than the sum of its proper divisors (1033825881).

19642691359 is a wasteful number, since it uses less digits than its factorization.

19642691359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033825880.

The product of its digits is 3149280, while the sum is 55.

The spelling of 19642691359 in words is "nineteen billion, six hundred forty-two million, six hundred ninety-one thousand, three hundred fifty-nine".