196716661 has 4 divisors (see below), whose sum is σ = 196791424. Its totient is φ = 196641900.

The previous prime is 196716649. The next prime is 196716683. The reversal of 196716661 is 166617691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 166617691 = 613 ⋅271807.

It is a cyclic number.

It is not a de Polignac number, because 196716661 - 2⁵ = 196716629 is a prime.

It is a super-3 number, since 3×196716661³ (a number of 26 digits) contains 333 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 (196716691) 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, 33285 + ... + 38746.

It is an arithmetic number, because the mean of its divisors is an integer number (49197856).

Almost surely, 2^196716661 is an apocalyptic number.

It is an amenable number.

196716661 is a deficient number, since it is larger than the sum of its proper divisors (74763).

196716661 is an equidigital number, since it uses as much as digits as its factorization.

196716661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74762.

The product of its digits is 81648, while the sum is 43.

The square root of 196716661 is about 14025.5716817533. The cubic root of 196716661 is about 581.5856935346.

The spelling of 196716661 in words is "one hundred ninety-six million, seven hundred sixteen thousand, six hundred sixty-one".