196158785691 has 8 divisors (see below), whose sum is σ = 285321870144. Its totient is φ = 118884112520.

The previous prime is 196158785687. The next prime is 196158785737. The reversal of 196158785691 is 196587851691.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 196158785691 - 2² = 196158785687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (196158785621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2972102781 + ... + 2972102846.

It is an arithmetic number, because the mean of its divisors is an integer number (35665233768).

Almost surely, 2^196158785691 is an apocalyptic number.

196158785691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

196158785691 is a deficient number, since it is larger than the sum of its proper divisors (89163084453).

196158785691 is a wasteful number, since it uses less digits than its factorization.

196158785691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5944205641.

The product of its digits is 32659200, while the sum is 66.

It can be divided in two parts, 19615 and 8785691, that added together give a triangular number (8805306 = T₄₁₉₆).

The spelling of 196158785691 in words is "one hundred ninety-six billion, one hundred fifty-eight million, seven hundred eighty-five thousand, six hundred ninety-one".