11215563145 has 4 divisors (see below), whose sum is σ = 13458675780. Its totient is φ = 8972450512.

The previous prime is 11215563137. The next prime is 11215563179. The reversal of 11215563145 is 54136551211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8268810489 + 2946752656 = 90933^2 + 54284^2 .

It is a cyclic number.

It is not a de Polignac number, because 11215563145 - 2³ = 11215563137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11215563145.

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, 1121556310 + ... + 1121556319.

It is an arithmetic number, because the mean of its divisors is an integer number (3364668945).

Almost surely, 2^11215563145 is an apocalyptic number.

It is an amenable number.

11215563145 is a deficient number, since it is larger than the sum of its proper divisors (2243112635).

11215563145 is an equidigital number, since it uses as much as digits as its factorization.

11215563145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243112634.

The product of its digits is 18000, while the sum is 34.

The spelling of 11215563145 in words is "eleven billion, two hundred fifteen million, five hundred sixty-three thousand, one hundred forty-five".