11561275232778 has 16 divisors (see below), whose sum is σ = 23206025380320. Its totient is φ = 3839845925136.

The previous prime is 11561275232761. The next prime is 11561275232789. The reversal of 11561275232778 is 87723257216511.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3478119648 + ... + 3478122971.

It is an arithmetic number, because the mean of its divisors is an integer number (1450376586270).

Almost surely, 2^{11561275232778} is an apocalyptic number.

11561275232778 is an abundant number, since it is smaller than the sum of its proper divisors (11644750147542).

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

11561275232778 is a wasteful number, since it uses less digits than its factorization.

11561275232778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6956242901.

The product of its digits is 9878400, while the sum is 57.

The spelling of 11561275232778 in words is "eleven trillion, five hundred sixty-one billion, two hundred seventy-five million, two hundred thirty-two thousand, seven hundred seventy-eight".