2155615366211 has 4 divisors (see below), whose sum is σ = 2155848995832. Its totient is φ = 2155381736592.

The previous prime is 2155615366171. The next prime is 2155615366291. The reversal of 2155615366211 is 1126635165512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2155615366211 - 2³⁴ = 2138435497027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155615366291) 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, 116800970 + ... + 116819423.

It is an arithmetic number, because the mean of its divisors is an integer number (538962248958).

Almost surely, 2^{2155615366211} is an apocalyptic number.

2155615366211 is a deficient number, since it is larger than the sum of its proper divisors (233629621).

2155615366211 is an equidigital number, since it uses as much as digits as its factorization.

2155615366211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233629620.

The product of its digits is 324000, while the sum is 44.

The spelling of 2155615366211 in words is "two trillion, one hundred fifty-five billion, six hundred fifteen million, three hundred sixty-six thousand, two hundred eleven".