121759163917 has 2 divisors, whose sum is σ = 121759163918. Its totient is φ = 121759163916.

The previous prime is 121759163899. The next prime is 121759163941. The reversal of 121759163917 is 719361957121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120371526916 + 1387637001 = 346946^2 + 37251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121759163917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121759163417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60879581958 + 60879581959.

It is an arithmetic number, because the mean of its divisors is an integer number (60879581959).

Almost surely, 2^121759163917 is an apocalyptic number.

It is an amenable number.

121759163917 is a deficient number, since it is larger than the sum of its proper divisors (1).

121759163917 is an equidigital number, since it uses as much as digits as its factorization.

121759163917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714420, while the sum is 52.

The spelling of 121759163917 in words is "one hundred twenty-one billion, seven hundred fifty-nine million, one hundred sixty-three thousand, nine hundred seventeen".