19649689161 has 16 divisors (see below), whose sum is σ = 26745016320. Its totient is φ = 12828767120.

The previous prime is 19649689141. The next prime is 19649689177. The reversal of 19649689161 is 16198694691.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19649689161 is a prime.

It is a super-2 number, since 2×19649689161² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19649689095 and 19649689104.

It is not an unprimeable number, because it can be changed into a prime (19649689121) 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, 164505 + ... + 257606.

It is an arithmetic number, because the mean of its divisors is an integer number (1671563520).

Almost surely, 2^19649689161 is an apocalyptic number.

It is an amenable number.

19649689161 is a deficient number, since it is larger than the sum of its proper divisors (7095327159).

19649689161 is a wasteful number, since it uses less digits than its factorization.

19649689161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422436.

The product of its digits is 5038848, while the sum is 60.

The spelling of 19649689161 in words is "nineteen billion, six hundred forty-nine million, six hundred eighty-nine thousand, one hundred sixty-one".