18934617511 has 2 divisors, whose sum is σ = 18934617512. Its totient is φ = 18934617510.

The previous prime is 18934617469. The next prime is 18934617529. The reversal of 18934617511 is 11571643981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18934617511 - 2¹¹ = 18934615463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18934617551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9467308755 + 9467308756.

It is an arithmetic number, because the mean of its divisors is an integer number (9467308756).

Almost surely, 2^18934617511 is an apocalyptic number.

18934617511 is a deficient number, since it is larger than the sum of its proper divisors (1).

18934617511 is an equidigital number, since it uses as much as digits as its factorization.

18934617511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 46.

The spelling of 18934617511 in words is "eighteen billion, nine hundred thirty-four million, six hundred seventeen thousand, five hundred eleven".