11556289945 has 4 divisors (see below), whose sum is σ = 13867547940. Its totient is φ = 9245031952.

The previous prime is 11556289933. The next prime is 11556289961. The reversal of 11556289945 is 54998265511.

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 8936488089 + 2619801856 = 94533^2 + 51184^2 .

It is a cyclic number.

It is not a de Polignac number, because 11556289945 - 2¹³ = 11556281753 is a prime.

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, 1155628990 + ... + 1155628999.

It is an arithmetic number, because the mean of its divisors is an integer number (3466886985).

Almost surely, 2^11556289945 is an apocalyptic number.

It is an amenable number.

11556289945 is a deficient number, since it is larger than the sum of its proper divisors (2311257995).

11556289945 is an equidigital number, since it uses as much as digits as its factorization.

11556289945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311257994.

The product of its digits is 3888000, while the sum is 55.

The spelling of 11556289945 in words is "eleven billion, five hundred fifty-six million, two hundred eighty-nine thousand, nine hundred forty-five".