11556868061 has 2 divisors, whose sum is σ = 11556868062. Its totient is φ = 11556868060.

The previous prime is 11556868031. The next prime is 11556868067. The reversal of 11556868061 is 16086865511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10384832836 + 1172035225 = 101906^2 + 34235^2 .

It is a cyclic number.

It is not a de Polignac number, because 11556868061 - 2⁶ = 11556867997 is a prime.

It is a super-2 number, since 2×11556868061² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11556867997 and 11556868015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11556868067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5778434030 + 5778434031.

It is an arithmetic number, because the mean of its divisors is an integer number (5778434031).

Almost surely, 2^11556868061 is an apocalyptic number.

It is an amenable number.

11556868061 is a deficient number, since it is larger than the sum of its proper divisors (1).

11556868061 is an equidigital number, since it uses as much as digits as its factorization.

11556868061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 47.

The spelling of 11556868061 in words is "eleven billion, five hundred fifty-six million, eight hundred sixty-eight thousand, sixty-one".