19742026699 has 4 divisors (see below), whose sum is σ = 19923146320. Its totient is φ = 19560907080.

The previous prime is 19742026651. The next prime is 19742026723. The reversal of 19742026699 is 99662024791.

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-19742026699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19742056699) 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, 90559647 + ... + 90559864.

It is an arithmetic number, because the mean of its divisors is an integer number (4980786580).

Almost surely, 2^19742026699 is an apocalyptic number.

19742026699 is a deficient number, since it is larger than the sum of its proper divisors (181119621).

19742026699 is a wasteful number, since it uses less digits than its factorization.

19742026699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181119620.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The spelling of 19742026699 in words is "nineteen billion, seven hundred forty-two million, twenty-six thousand, six hundred ninety-nine".