196620915493 has 2 divisors, whose sum is σ = 196620915494. Its totient is φ = 196620915492.

The previous prime is 196620915433. The next prime is 196620915521. The reversal of 196620915493 is 394519026691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195888563649 + 732351844 = 442593^2 + 27062^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196620915493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196620915433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98310457746 + 98310457747.

It is an arithmetic number, because the mean of its divisors is an integer number (98310457747).

Almost surely, 2^196620915493 is an apocalyptic number.

It is an amenable number.

196620915493 is a deficient number, since it is larger than the sum of its proper divisors (1).

196620915493 is an equidigital number, since it uses as much as digits as its factorization.

196620915493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3149280, while the sum is 55.

The spelling of 196620915493 in words is "one hundred ninety-six billion, six hundred twenty million, nine hundred fifteen thousand, four hundred ninety-three".