11865543251 has 2 divisors, whose sum is σ = 11865543252. Its totient is φ = 11865543250.

The previous prime is 11865543241. The next prime is 11865543257. The reversal of 11865543251 is 15234556811.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11865543251 - 2¹⁴ = 11865526867 is a prime.

It is a super-2 number, since 2×11865543251² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11865543199 and 11865543208.

It is not a weakly prime, because it can be changed into another prime (11865543257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5932771625 + 5932771626.

It is an arithmetic number, because the mean of its divisors is an integer number (5932771626).

Almost surely, 2^11865543251 is an apocalyptic number.

11865543251 is a deficient number, since it is larger than the sum of its proper divisors (1).

11865543251 is an equidigital number, since it uses as much as digits as its factorization.

11865543251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144000, while the sum is 41.

The spelling of 11865543251 in words is "eleven billion, eight hundred sixty-five million, five hundred forty-three thousand, two hundred fifty-one".