19916722857 has 8 divisors (see below), whose sum is σ = 26579580480. Its totient is φ = 13265840240.

The previous prime is 19916722829. The next prime is 19916722871. The reversal of 19916722857 is 75822761991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19916722857 - 2⁸ = 19916722601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19916722797 and 19916722806.

It is not an unprimeable number, because it can be changed into a prime (19916722817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2989869 + ... + 2996522.

It is an arithmetic number, because the mean of its divisors is an integer number (3322447560).

Almost surely, 2^19916722857 is an apocalyptic number.

It is an amenable number.

19916722857 is a deficient number, since it is larger than the sum of its proper divisors (6662857623).

19916722857 is a wasteful number, since it uses less digits than its factorization.

19916722857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5987503.

The product of its digits is 3810240, while the sum is 57.

The spelling of 19916722857 in words is "nineteen billion, nine hundred sixteen million, seven hundred twenty-two thousand, eight hundred fifty-seven".