196553623593581 has 2 divisors, whose sum is σ = 196553623593582. Its totient is φ = 196553623593580.

The previous prime is 196553623593559. The next prime is 196553623593707. The reversal of 196553623593581 is 185395326355691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192795585457225 + 3758038136356 = 13885085^2 + 1938566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196553623593581 is a prime.

It is a super-2 number, since 2×196553623593581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196553623793581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98276811796790 + 98276811796791.

It is an arithmetic number, because the mean of its divisors is an integer number (98276811796791).

Almost surely, 2^{196553623593581} is an apocalyptic number.

It is an amenable number.

196553623593581 is a deficient number, since it is larger than the sum of its proper divisors (1).

196553623593581 is an equidigital number, since it uses as much as digits as its factorization.

196553623593581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 787320000, while the sum is 71.

The spelling of 196553623593581 in words is "one hundred ninety-six trillion, five hundred fifty-three billion, six hundred twenty-three million, five hundred ninety-three thousand, five hundred eighty-one".