196661407 has 2 divisors, whose sum is σ = 196661408. Its totient is φ = 196661406.

The previous prime is 196661363. The next prime is 196661449. The reversal of 196661407 is 704166691.

It is a strong prime.

It is an emirp because it is prime and its reverse (704166691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196661407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 196661407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196601407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98330703 + 98330704.

It is an arithmetic number, because the mean of its divisors is an integer number (98330704).

Almost surely, 2^196661407 is an apocalyptic number.

196661407 is a deficient number, since it is larger than the sum of its proper divisors (1).

196661407 is an equidigital number, since it uses as much as digits as its factorization.

196661407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 196661407 is about 14023.6017841352. The cubic root of 196661407 is about 581.5312362848.

The spelling of 196661407 in words is "one hundred ninety-six million, six hundred sixty-one thousand, four hundred seven".