123171963559 has 2 divisors, whose sum is σ = 123171963560. Its totient is φ = 123171963558.

The previous prime is 123171963547. The next prime is 123171963599. The reversal of 123171963559 is 955369171321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123171963559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123171963599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61585981779 + 61585981780.

It is an arithmetic number, because the mean of its divisors is an integer number (61585981780).

Almost surely, 2^123171963559 is an apocalyptic number.

123171963559 is a deficient number, since it is larger than the sum of its proper divisors (1).

123171963559 is an equidigital number, since it uses as much as digits as its factorization.

123171963559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1530900, while the sum is 52.

The spelling of 123171963559 in words is "one hundred twenty-three billion, one hundred seventy-one million, nine hundred sixty-three thousand, five hundred fifty-nine".