18428949647 has 2 divisors, whose sum is σ = 18428949648. Its totient is φ = 18428949646.

The previous prime is 18428949619. The next prime is 18428949659. The reversal of 18428949647 is 74694982481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18428949647 - 2⁸ = 18428949391 is a prime.

It is a super-2 number, since 2×18428949647² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18428949647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18428949947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214474823 + 9214474824.

It is an arithmetic number, because the mean of its divisors is an integer number (9214474824).

Almost surely, 2^18428949647 is an apocalyptic number.

18428949647 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428949647 is an equidigital number, since it uses as much as digits as its factorization.

18428949647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27869184, while the sum is 62.

The spelling of 18428949647 in words is "eighteen billion, four hundred twenty-eight million, nine hundred forty-nine thousand, six hundred forty-seven".