18219639829 has 2 divisors, whose sum is σ = 18219639830. Its totient is φ = 18219639828.

The previous prime is 18219639793. The next prime is 18219639853. The reversal of 18219639829 is 92893691281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9721565604 + 8498074225 = 98598^2 + 92185^2 .

It is a cyclic number.

It is not a de Polignac number, because 18219639829 - 2¹³ = 18219631637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18219639929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109819914 + 9109819915.

It is an arithmetic number, because the mean of its divisors is an integer number (9109819915).

Almost surely, 2^18219639829 is an apocalyptic number.

It is an amenable number.

18219639829 is a deficient number, since it is larger than the sum of its proper divisors (1).

18219639829 is an equidigital number, since it uses as much as digits as its factorization.

18219639829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 58.

The spelling of 18219639829 in words is "eighteen billion, two hundred nineteen million, six hundred thirty-nine thousand, eight hundred twenty-nine".