2155071260265 has 64 divisors (see below), whose sum is σ = 4403799816192. Its totient is φ = 873769766400.

The previous prime is 2155071260261. The next prime is 2155071260267. The reversal of 2155071260265 is 5620621705512.

It is not a de Polignac number, because 2155071260265 - 2² = 2155071260261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2155071260261) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22707067 + ... + 22801776.

It is an arithmetic number, because the mean of its divisors is an integer number (68809372128).

Almost surely, 2^{2155071260265} is an apocalyptic number.

It is an amenable number.

2155071260265 is an abundant number, since it is smaller than the sum of its proper divisors (2248728555927).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155071260265 is a wasteful number, since it uses less digits than its factorization.

2155071260265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45508910.

The product of its (nonzero) digits is 252000, while the sum is 42.

Adding to 2155071260265 its reverse (5620621705512), we get a palindrome (7775692965777).

The spelling of 2155071260265 in words is "two trillion, one hundred fifty-five billion, seventy-one million, two hundred sixty thousand, two hundred sixty-five".