11721556275 has 48 divisors (see below), whose sum is σ = 22767709440. Its totient is φ = 5246006400.

The previous prime is 11721556271. The next prime is 11721556291. The reversal of 11721556275 is 57265512711.

It is not a de Polignac number, because 11721556275 - 2² = 11721556271 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11721556271) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 535735 + ... + 557184.

It is an arithmetic number, because the mean of its divisors is an integer number (474327280).

Almost surely, 2^11721556275 is an apocalyptic number.

11721556275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11721556275 is a deficient number, since it is larger than the sum of its proper divisors (11046153165).

11721556275 is a wasteful number, since it uses less digits than its factorization.

11721556275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092956 (or 1092951 counting only the distinct ones).

The product of its digits is 147000, while the sum is 42.

The spelling of 11721556275 in words is "eleven billion, seven hundred twenty-one million, five hundred fifty-six thousand, two hundred seventy-five".