196821889885 has 4 divisors (see below), whose sum is σ = 236186267868. Its totient is φ = 157457511904.

The previous prime is 196821889807. The next prime is 196821889939. The reversal of 196821889885 is 588988128691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 588988128691 = 887 ⋅664022693.

It can be written as a sum of positive squares in 2 ways, for example, as 142903656676 + 53918233209 = 378026^2 + 232203^2 .

It is a cyclic number.

It is not a de Polignac number, because 196821889885 - 2¹⁷ = 196821758813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19682188984 + ... + 19682188993.

It is an arithmetic number, because the mean of its divisors is an integer number (59046566967).

Almost surely, 2^196821889885 is an apocalyptic number.

It is an amenable number.

196821889885 is a deficient number, since it is larger than the sum of its proper divisors (39364377983).

196821889885 is an equidigital number, since it uses as much as digits as its factorization.

196821889885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39364377982.

The product of its digits is 159252480, while the sum is 73.

The spelling of 196821889885 in words is "one hundred ninety-six billion, eight hundred twenty-one million, eight hundred eighty-nine thousand, eight hundred eighty-five".