121755717161 has 8 divisors (see below), whose sum is σ = 131153279040. Its totient is φ = 112362689232.

The previous prime is 121755717151. The next prime is 121755717169. The reversal of 121755717161 is 161717557121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121755717161 is a prime.

It is a super-2 number, since 2×121755717161² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121755717169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1077605 + ... + 1185218.

It is an arithmetic number, because the mean of its divisors is an integer number (16394159880).

Almost surely, 2^121755717161 is an apocalyptic number.

It is an amenable number.

121755717161 is a deficient number, since it is larger than the sum of its proper divisors (9397561879).

121755717161 is a wasteful number, since it uses less digits than its factorization.

121755717161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266975.

The product of its digits is 102900, while the sum is 44.

The spelling of 121755717161 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred seventeen thousand, one hundred sixty-one".