11623551551681 has 2 divisors, whose sum is σ = 11623551551682. Its totient is φ = 11623551551680.

The previous prime is 11623551551597. The next prime is 11623551551687. The reversal of 11623551551681 is 18615515532611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9598124471056 + 2025427080625 = 3098084^2 + 1423175^2 .

It is a cyclic number.

It is not a de Polignac number, because 11623551551681 - 2¹⁰ = 11623551550657 is a prime.

It is a super-2 number, since 2×11623551551681² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11623551551687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5811775775840 + 5811775775841.

It is an arithmetic number, because the mean of its divisors is an integer number (5811775775841).

Almost surely, 2^{11623551551681} is an apocalyptic number.

It is an amenable number.

11623551551681 is a deficient number, since it is larger than the sum of its proper divisors (1).

11623551551681 is an equidigital number, since it uses as much as digits as its factorization.

11623551551681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080000, while the sum is 50.

The spelling of 11623551551681 in words is "eleven trillion, six hundred twenty-three billion, five hundred fifty-one million, five hundred fifty-one thousand, six hundred eighty-one".