121568163181 has 4 divisors (see below), whose sum is σ = 125489716864. Its totient is φ = 117646609500.

The previous prime is 121568163149. The next prime is 121568163193. The reversal of 121568163181 is 181361865121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 181361865121 = 103 ⋅1760794807.

It is a cyclic number.

It is not a de Polignac number, because 121568163181 - 2⁵ = 121568163149 is a prime.

It is a super-2 number, since 2×121568163181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121568163121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1960776795 + ... + 1960776856.

It is an arithmetic number, because the mean of its divisors is an integer number (31372429216).

Almost surely, 2^121568163181 is an apocalyptic number.

It is an amenable number.

121568163181 is a deficient number, since it is larger than the sum of its proper divisors (3921553683).

121568163181 is an equidigital number, since it uses as much as digits as its factorization.

121568163181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3921553682.

The product of its digits is 69120, while the sum is 43.

The spelling of 121568163181 in words is "one hundred twenty-one billion, five hundred sixty-eight million, one hundred sixty-three thousand, one hundred eighty-one".