11156255565 has 96 divisors (see below), whose sum is σ = 22482302976. Its totient is φ = 4682280960.

The previous prime is 11156255549. The next prime is 11156255573. The reversal of 11156255565 is 56555265111.

It is not a de Polignac number, because 11156255565 - 2⁴ = 11156255549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1821949 + ... + 1828061.

It is an arithmetic number, because the mean of its divisors is an integer number (234190656).

Almost surely, 2^11156255565 is an apocalyptic number.

11156255565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11156255565 is an abundant number, since it is smaller than the sum of its proper divisors (11326047411).

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

11156255565 is a wasteful number, since it uses less digits than its factorization.

11156255565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6339 (or 6332 counting only the distinct ones).

The product of its digits is 225000, while the sum is 42.

The spelling of 11156255565 in words is "eleven billion, one hundred fifty-six million, two hundred fifty-five thousand, five hundred sixty-five".