16505250511 has 2 divisors, whose sum is σ = 16505250512. Its totient is φ = 16505250510.

The previous prime is 16505250491. The next prime is 16505250533. The reversal of 16505250511 is 11505250561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16505250511 - 2⁷ = 16505250383 is a prime.

It is a super-2 number, since 2×16505250511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16505250551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252625255 + 8252625256.

It is an arithmetic number, because the mean of its divisors is an integer number (8252625256).

Almost surely, 2^16505250511 is an apocalyptic number.

16505250511 is a deficient number, since it is larger than the sum of its proper divisors (1).

16505250511 is an equidigital number, since it uses as much as digits as its factorization.

16505250511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7500, while the sum is 31.

The spelling of 16505250511 in words is "sixteen billion, five hundred five million, two hundred fifty thousand, five hundred eleven".