18611361413 has 2 divisors, whose sum is σ = 18611361414. Its totient is φ = 18611361412.

The previous prime is 18611361347. The next prime is 18611361427. The reversal of 18611361413 is 31416311681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17999442244 + 611919169 = 134162^2 + 24737^2 .

It is a cyclic number.

It is not a de Polignac number, because 18611361413 - 2¹⁰ = 18611360389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18611360413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9305680706 + 9305680707.

It is an arithmetic number, because the mean of its divisors is an integer number (9305680707).

Almost surely, 2^18611361413 is an apocalyptic number.

It is an amenable number.

18611361413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18611361413 is an equidigital number, since it uses as much as digits as its factorization.

18611361413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The spelling of 18611361413 in words is "eighteen billion, six hundred eleven million, three hundred sixty-one thousand, four hundred thirteen".