195557643943 has 2 divisors, whose sum is σ = 195557643944. Its totient is φ = 195557643942.

The previous prime is 195557643877. The next prime is 195557643977. The reversal of 195557643943 is 349346755591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195557643943 - 2³³ = 186967709351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195557643143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97778821971 + 97778821972.

It is an arithmetic number, because the mean of its divisors is an integer number (97778821972).

Almost surely, 2^195557643943 is an apocalyptic number.

195557643943 is a deficient number, since it is larger than the sum of its proper divisors (1).

195557643943 is an equidigital number, since it uses as much as digits as its factorization.

195557643943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236000, while the sum is 61.

The spelling of 195557643943 in words is "one hundred ninety-five billion, five hundred fifty-seven million, six hundred forty-three thousand, nine hundred forty-three".