18506968061 has 2 divisors, whose sum is σ = 18506968062. Its totient is φ = 18506968060.

The previous prime is 18506968021. The next prime is 18506968079. The reversal of 18506968061 is 16086960581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16513792036 + 1993176025 = 128506^2 + 44645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18506968061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18506968021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9253484030 + 9253484031.

It is an arithmetic number, because the mean of its divisors is an integer number (9253484031).

Almost surely, 2^18506968061 is an apocalyptic number.

It is an amenable number.

18506968061 is a deficient number, since it is larger than the sum of its proper divisors (1).

18506968061 is an equidigital number, since it uses as much as digits as its factorization.

18506968061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 18506968061 in words is "eighteen billion, five hundred six million, nine hundred sixty-eight thousand, sixty-one".