18679790413 has 2 divisors, whose sum is σ = 18679790414. Its totient is φ = 18679790412.

The previous prime is 18679790401. The next prime is 18679790431. The reversal of 18679790413 is 31409797681.

Together with next prime (18679790431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16042248964 + 2637541449 = 126658^2 + 51357^2 .

It is a cyclic number.

It is not a de Polignac number, because 18679790413 - 2⁹ = 18679789901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18679790513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9339895206 + 9339895207.

It is an arithmetic number, because the mean of its divisors is an integer number (9339895207).

Almost surely, 2^18679790413 is an apocalyptic number.

It is an amenable number.

18679790413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18679790413 is an equidigital number, since it uses as much as digits as its factorization.

18679790413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 18679790413 in words is "eighteen billion, six hundred seventy-nine million, seven hundred ninety thousand, four hundred thirteen".