2156111101265 has 8 divisors (see below), whose sum is σ = 2822545441728. Its totient is φ = 1568080800880.

The previous prime is 2156111101241. The next prime is 2156111101271. The reversal of 2156111101265 is 5621011116512.

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

It is not a de Polignac number, because 2156111101265 - 2⁸ = 2156111101009 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19601009957 + ... + 19601010066.

It is an arithmetic number, because the mean of its divisors is an integer number (352818180216).

Almost surely, 2^{2156111101265} is an apocalyptic number.

It is an amenable number.

2156111101265 is a deficient number, since it is larger than the sum of its proper divisors (666434340463).

2156111101265 is a wasteful number, since it uses less digits than its factorization.

2156111101265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39202020039.

The product of its (nonzero) digits is 3600, while the sum is 32.

Adding to 2156111101265 its reverse (5621011116512), we get a palindrome (7777122217777).

The spelling of 2156111101265 in words is "two trillion, one hundred fifty-six billion, one hundred eleven million, one hundred one thousand, two hundred sixty-five".