11778844337861 has 2 divisors, whose sum is σ = 11778844337862. Its totient is φ = 11778844337860.

The previous prime is 11778844337723. The next prime is 11778844337891. The reversal of 11778844337861 is 16873344887711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11341275317761 + 437569020100 = 3367681^2 + 661490^2 .

It is a cyclic number.

It is not a de Polignac number, because 11778844337861 - 2³⁴ = 11761664468677 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11778844337791 and 11778844337800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11778844337891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5889422168930 + 5889422168931.

It is an arithmetic number, because the mean of its divisors is an integer number (5889422168931).

Almost surely, 2^{11778844337861} is an apocalyptic number.

It is an amenable number.

11778844337861 is a deficient number, since it is larger than the sum of its proper divisors (1).

11778844337861 is an equidigital number, since it uses as much as digits as its factorization.

11778844337861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151732224, while the sum is 68.

The spelling of 11778844337861 in words is "eleven trillion, seven hundred seventy-eight billion, eight hundred forty-four million, three hundred thirty-seven thousand, eight hundred sixty-one".