11156555155 has 4 divisors (see below), whose sum is σ = 13387866192. Its totient is φ = 8925244120.

The previous prime is 11156555119. The next prime is 11156555219. The reversal of 11156555155 is 55155565111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55155565111 = 947 ⋅58242413.

It is not a de Polignac number, because 11156555155 - 2¹⁹ = 11156030867 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115655511 + ... + 1115655520.

It is an arithmetic number, because the mean of its divisors is an integer number (3346966548).

Almost surely, 2^11156555155 is an apocalyptic number.

11156555155 is a deficient number, since it is larger than the sum of its proper divisors (2231311037).

11156555155 is an equidigital number, since it uses as much as digits as its factorization.

11156555155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231311036.

The product of its digits is 93750, while the sum is 40.

The spelling of 11156555155 in words is "eleven billion, one hundred fifty-six million, five hundred fifty-five thousand, one hundred fifty-five".