18220259639 has 2 divisors, whose sum is σ = 18220259640. Its totient is φ = 18220259638.

The previous prime is 18220259569. The next prime is 18220259663. The reversal of 18220259639 is 93695202281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18220259639 - 2¹⁶ = 18220194103 is a prime.

It is a super-2 number, since 2×18220259639² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18220259593 and 18220259602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18220259039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9110129819 + 9110129820.

It is an arithmetic number, because the mean of its divisors is an integer number (9110129820).

Almost surely, 2^18220259639 is an apocalyptic number.

18220259639 is a deficient number, since it is larger than the sum of its proper divisors (1).

18220259639 is an equidigital number, since it uses as much as digits as its factorization.

18220259639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 18220259639 in words is "eighteen billion, two hundred twenty million, two hundred fifty-nine thousand, six hundred thirty-nine".