121655776159 has 16 divisors (see below), whose sum is σ = 131278226688. Its totient is φ = 112308531712.

The previous prime is 121655776147. The next prime is 121655776181. The reversal of 121655776159 is 951677556121.

It is a cyclic number.

It is not a de Polignac number, because 121655776159 - 2¹¹ = 121655774111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121655776139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3702069 + ... + 3734785.

It is an arithmetic number, because the mean of its divisors is an integer number (8204889168).

Almost surely, 2^121655776159 is an apocalyptic number.

121655776159 is a deficient number, since it is larger than the sum of its proper divisors (9622450529).

121655776159 is a wasteful number, since it uses less digits than its factorization.

121655776159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36914.

The product of its digits is 3969000, while the sum is 55.

The spelling of 121655776159 in words is "one hundred twenty-one billion, six hundred fifty-five million, seven hundred seventy-six thousand, one hundred fifty-nine".