168129561619 has 2 divisors, whose sum is σ = 168129561620. Its totient is φ = 168129561618.

The previous prime is 168129561583. The next prime is 168129561647. The reversal of 168129561619 is 916165921861.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (916165921861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 168129561619 - 2⁹ = 168129561107 is a prime.

It is a super-2 number, since 2×168129561619² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 168129561619.

It is not a weakly prime, because it can be changed into another prime (168129568619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84064780809 + 84064780810.

It is an arithmetic number, because the mean of its divisors is an integer number (84064780810).

Almost surely, 2^168129561619 is an apocalyptic number.

168129561619 is a deficient number, since it is larger than the sum of its proper divisors (1).

168129561619 is an equidigital number, since it uses as much as digits as its factorization.

168129561619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 55.

The spelling of 168129561619 in words is "one hundred sixty-eight billion, one hundred twenty-nine million, five hundred sixty-one thousand, six hundred nineteen".