121655655601 has 4 divisors (see below), whose sum is σ = 121666166512. Its totient is φ = 121645144692.

The previous prime is 121655655587. The next prime is 121655655607. The reversal of 121655655601 is 106556556121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121655655601 - 2⁹ = 121655655089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121655655607) 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, 5238075 + ... + 5261248.

It is an arithmetic number, because the mean of its divisors is an integer number (30416541628).

Almost surely, 2^121655655601 is an apocalyptic number.

It is an amenable number.

121655655601 is a deficient number, since it is larger than the sum of its proper divisors (10510911).

121655655601 is a wasteful number, since it uses less digits than its factorization.

121655655601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510910.

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 121655655601 in words is "one hundred twenty-one billion, six hundred fifty-five million, six hundred fifty-five thousand, six hundred one".