11864663246861 has 2 divisors, whose sum is σ = 11864663246862. Its totient is φ = 11864663246860.

The previous prime is 11864663246857. The next prime is 11864663246903. The reversal of 11864663246861 is 16864236646811.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10998309976900 + 866353269961 = 3316370^2 + 930781^2 .

It is a cyclic number.

It is not a de Polignac number, because 11864663246861 - 2² = 11864663246857 is a prime.

It is a super-2 number, since 2×11864663246861² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11864663246794 and 11864663246803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11864663246561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5932331623430 + 5932331623431.

It is an arithmetic number, because the mean of its divisors is an integer number (5932331623431).

Almost surely, 2^{11864663246861} is an apocalyptic number.

It is an amenable number.

11864663246861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11864663246861 is an equidigital number, since it uses as much as digits as its factorization.

11864663246861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47775744, while the sum is 62.

The spelling of 11864663246861 in words is "eleven trillion, eight hundred sixty-four billion, six hundred sixty-three million, two hundred forty-six thousand, eight hundred sixty-one".