19787969169 has 16 divisors (see below), whose sum is σ = 29462832000. Its totient is φ = 13125684528.

The previous prime is 19787969167. The next prime is 19787969171. The reversal of 19787969169 is 96196978791.

It is an interprime number because it is at equal distance from previous prime (19787969167) and next prime (19787969171).

It is not a de Polignac number, because 19787969169 - 2¹ = 19787969167 is a prime.

It is a super-2 number, since 2×19787969169² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19787969097 and 19787969106.

It is not an unprimeable number, because it can be changed into a prime (19787969167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1836054 + ... + 1846799.

It is an arithmetic number, because the mean of its divisors is an integer number (1841427000).

Almost surely, 2^19787969169 is an apocalyptic number.

It is an amenable number.

19787969169 is a deficient number, since it is larger than the sum of its proper divisors (9674862831).

19787969169 is a wasteful number, since it uses less digits than its factorization.

19787969169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3683061 (or 3683055 counting only the distinct ones).

The product of its digits is 92588832, while the sum is 72.

The spelling of 19787969169 in words is "nineteen billion, seven hundred eighty-seven million, nine hundred sixty-nine thousand, one hundred sixty-nine".