196639567 has 4 divisors (see below), whose sum is σ = 201435696. Its totient is φ = 191843440.

The previous prime is 196639543. The next prime is 196639601. The reversal of 196639567 is 765936691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 765936691 = 13 ⋅58918207.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196639567 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 (196639067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2398003 + ... + 2398084.

It is an arithmetic number, because the mean of its divisors is an integer number (50358924).

Almost surely, 2^196639567 is an apocalyptic number.

196639567 is a deficient number, since it is larger than the sum of its proper divisors (4796129).

196639567 is an equidigital number, since it uses as much as digits as its factorization.

196639567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4796128.

The product of its digits is 1837080, while the sum is 52.

The square root of 196639567 is about 14022.8230752584. The cubic root of 196639567 is about 581.5097083999.

The spelling of 196639567 in words is "one hundred ninety-six million, six hundred thirty-nine thousand, five hundred sixty-seven".