11722261287 has 16 divisors (see below), whose sum is σ = 17175025152. Its totient is φ = 7052541120.

The previous prime is 11722261253. The next prime is 11722261319. The reversal of 11722261287 is 78216222711.

It is not a de Polignac number, because 11722261287 - 2¹¹ = 11722259239 is a prime.

It is a super-2 number, since 2×11722261287² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11722261207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1291903 + ... + 1300944.

It is an arithmetic number, because the mean of its divisors is an integer number (1073439072).

Almost surely, 2^11722261287 is an apocalyptic number.

11722261287 is a deficient number, since it is larger than the sum of its proper divisors (5452763865).

11722261287 is a wasteful number, since it uses less digits than its factorization.

11722261287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592998.

The product of its digits is 37632, while the sum is 39.

Adding to 11722261287 its reverse (78216222711), we get a palindrome (89938483998).

The spelling of 11722261287 in words is "eleven billion, seven hundred twenty-two million, two hundred sixty-one thousand, two hundred eighty-seven".