2161115655 has 8 divisors (see below), whose sum is σ = 3457785072. Its totient is φ = 1152595008.

The previous prime is 2161115623. The next prime is 2161115657. The reversal of 2161115655 is 5565111612.

2161115655 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 2161115655 - 2⁵ = 2161115623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161115657) 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, 72037174 + ... + 72037203.

It is an arithmetic number, because the mean of its divisors is an integer number (432223134).

Almost surely, 2^2161115655 is an apocalyptic number.

2161115655 is a deficient number, since it is larger than the sum of its proper divisors (1296669417).

2161115655 is a wasteful number, since it uses less digits than its factorization.

2161115655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144074385.

The product of its digits is 9000, while the sum is 33.

The square root of 2161115655 is about 46487.8011418049. The cubic root of 2161115655 is about 1292.8833318086.

The spelling of 2161115655 in words is "two billion, one hundred sixty-one million, one hundred fifteen thousand, six hundred fifty-five".