19818849651 has 8 divisors (see below), whose sum is σ = 26480302080. Its totient is φ = 13184981832.

The previous prime is 19818849647. The next prime is 19818849653. The reversal of 19818849651 is 15694881891.

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

It is not a de Polignac number, because 19818849651 - 2² = 19818849647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19818849653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6894475 + ... + 6897348.

It is an arithmetic number, because the mean of its divisors is an integer number (3310037760).

Almost surely, 2^19818849651 is an apocalyptic number.

19818849651 is a deficient number, since it is larger than the sum of its proper divisors (6661452429).

19818849651 is a wasteful number, since it uses less digits than its factorization.

19818849651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13792305.

The product of its digits is 4976640, while the sum is 60.

The spelling of 19818849651 in words is "nineteen billion, eight hundred eighteen million, eight hundred forty-nine thousand, six hundred fifty-one".