16505661411 has 8 divisors (see below), whose sum is σ = 24452831760. Its totient is φ = 11003774256.

The previous prime is 16505661391. The next prime is 16505661427. The reversal of 16505661411 is 11416650561.

16505661411 is a `hidden beast` number, since 1 + 6 + 50 + 566 + 1 + 41 + 1 = 666.

It is not a de Polignac number, because 16505661411 - 2¹⁴ = 16505645027 is a prime.

It is a super-2 number, since 2×16505661411² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16505611411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305660370 + ... + 305660423.

It is an arithmetic number, because the mean of its divisors is an integer number (3056603970).

Almost surely, 2^16505661411 is an apocalyptic number.

16505661411 is a deficient number, since it is larger than the sum of its proper divisors (7947170349).

16505661411 is an equidigital number, since it uses as much as digits as its factorization.

16505661411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611320802 (or 611320796 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 16505661411 in words is "sixteen billion, five hundred five million, six hundred sixty-one thousand, four hundred eleven".