196661945 has 8 divisors (see below), whose sum is σ = 237443136. Its totient is φ = 156363696.

The previous prime is 196661939. The next prime is 196661981. The reversal of 196661945 is 549166691.

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 196661945 - 2¹⁰ = 196660921 is a prime.

It is a super-2 number, since 2×196661945² = 77351841222366050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 196661945.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119837 + ... + 121466.

It is an arithmetic number, because the mean of its divisors is an integer number (29680392).

Almost surely, 2^196661945 is an apocalyptic number.

It is an amenable number.

196661945 is a deficient number, since it is larger than the sum of its proper divisors (40781191).

196661945 is a wasteful number, since it uses less digits than its factorization.

196661945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241471.

The product of its digits is 349920, while the sum is 47.

The square root of 196661945 is about 14023.6209660701. The cubic root of 196661945 is about 581.5317665761.

The spelling of 196661945 in words is "one hundred ninety-six million, six hundred sixty-one thousand, nine hundred forty-five".