196665671 has 4 divisors (see below), whose sum is σ = 196695672. Its totient is φ = 196635672.

The previous prime is 196665661. The next prime is 196665701. The reversal of 196665671 is 176566691.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 196665671 - 2¹⁰ = 196664647 is a prime.

It is a super-2 number, since 2×196665671² = 77354772299760482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196665641) 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, 485 + ... + 19838.

It is an arithmetic number, because the mean of its divisors is an integer number (49173918).

Almost surely, 2^196665671 is an apocalyptic number.

196665671 is a deficient number, since it is larger than the sum of its proper divisors (30001).

196665671 is an equidigital number, since it uses as much as digits as its factorization.

196665671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30000.

The product of its digits is 408240, while the sum is 47.

The square root of 196665671 is about 14023.7538127279. The cubic root of 196665671 is about 581.5354391620.

The spelling of 196665671 in words is "one hundred ninety-six million, six hundred sixty-five thousand, six hundred seventy-one".