123344555681 has 2 divisors, whose sum is σ = 123344555682. Its totient is φ = 123344555680.

The previous prime is 123344555669. The next prime is 123344555713. The reversal of 123344555681 is 186555443321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108145611025 + 15198944656 = 328855^2 + 123284^2 .

It is a cyclic number.

It is not a de Polignac number, because 123344555681 - 2⁶ = 123344555617 is a prime.

It is a super-2 number, since 2×123344555681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123344555881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61672277840 + 61672277841.

It is an arithmetic number, because the mean of its divisors is an integer number (61672277841).

Almost surely, 2^123344555681 is an apocalyptic number.

It is an amenable number.

123344555681 is a deficient number, since it is larger than the sum of its proper divisors (1).

123344555681 is an equidigital number, since it uses as much as digits as its factorization.

123344555681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728000, while the sum is 47.

The spelling of 123344555681 in words is "one hundred twenty-three billion, three hundred forty-four million, five hundred fifty-five thousand, six hundred eighty-one".