18157426746689 has 2 divisors, whose sum is σ = 18157426746690. Its totient is φ = 18157426746688.

The previous prime is 18157426746677. The next prime is 18157426746721. The reversal of 18157426746689 is 98664762475181.

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., 17814874068289 + 342552678400 = 4220767^2 + 585280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18157426746689 is a prime.

It is a super-2 number, since 2×18157426746689² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18157426740689) 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, 9078713373344 + 9078713373345.

It is an arithmetic number, because the mean of its divisors is an integer number (9078713373345).

Almost surely, 2^{18157426746689} is an apocalyptic number.

It is an amenable number.

18157426746689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18157426746689 is an equidigital number, since it uses as much as digits as its factorization.

18157426746689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 975421440, while the sum is 74.

The spelling of 18157426746689 in words is "eighteen trillion, one hundred fifty-seven billion, four hundred twenty-six million, seven hundred forty-six thousand, six hundred eighty-nine".