18146556061 has 2 divisors, whose sum is σ = 18146556062. Its totient is φ = 18146556060.

The previous prime is 18146556049. The next prime is 18146556161. The reversal of 18146556061 is 16065564181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14769783961 + 3376772100 = 121531^2 + 58110^2 .

It is a cyclic number.

It is not a de Polignac number, because 18146556061 - 2²¹ = 18144458909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18146555999 and 18146556017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18146556161) 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, 9073278030 + 9073278031.

It is an arithmetic number, because the mean of its divisors is an integer number (9073278031).

Almost surely, 2^18146556061 is an apocalyptic number.

It is an amenable number.

18146556061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18146556061 is an equidigital number, since it uses as much as digits as its factorization.

18146556061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 18146556061 in words is "eighteen billion, one hundred forty-six million, five hundred fifty-six thousand, sixty-one".