19010643849 has 6 divisors (see below), whose sum is σ = 27459818906. Its totient is φ = 12673762560.

The previous prime is 19010643823. The next prime is 19010643853. The reversal of 19010643849 is 94834601091.

It can be written as a sum of positive squares in only one way, i.e., 15202890000 + 3807753849 = 123300^2 + 61707^2 .

It is not a de Polignac number, because 19010643849 - 2²⁸ = 18742208393 is a prime.

It is a super-2 number, since 2×19010643849² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19010643809) 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 5 ways as a sum of consecutive naturals, for example, 1056146872 + ... + 1056146889.

Almost surely, 2^19010643849 is an apocalyptic number.

It is an amenable number.

19010643849 is a deficient number, since it is larger than the sum of its proper divisors (8449175057).

19010643849 is a wasteful number, since it uses less digits than its factorization.

19010643849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112293767 (or 2112293764 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 19010643849 in words is "nineteen billion, ten million, six hundred forty-three thousand, eight hundred forty-nine".