196857821109 has 16 divisors (see below), whose sum is σ = 268960155200. Its totient is φ = 128005629696.

The previous prime is 196857821047. The next prime is 196857821119. The reversal of 196857821109 is 901128758691.

It is not a de Polignac number, because 196857821109 - 2⁸ = 196857820853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196857821119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 984724 + ... + 1167645.

It is an arithmetic number, because the mean of its divisors is an integer number (16810009700).

Almost surely, 2^196857821109 is an apocalyptic number.

It is an amenable number.

196857821109 is a deficient number, since it is larger than the sum of its proper divisors (72102334091).

196857821109 is a wasteful number, since it uses less digits than its factorization.

196857821109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153124.

The product of its (nonzero) digits is 2177280, while the sum is 57.

The spelling of 196857821109 in words is "one hundred ninety-six billion, eight hundred fifty-seven million, eight hundred twenty-one thousand, one hundred nine".