16505397135 has 96 divisors (see below), whose sum is σ = 30470888448. Its totient is φ = 8566508160.

The previous prime is 16505397133. The next prime is 16505397143. The reversal of 16505397135 is 53179350561.

16505397135 is a `hidden beast` number, since 1 + 6 + 505 + 3 + 9 + 7 + 135 = 666.

It is not a de Polignac number, because 16505397135 - 2¹ = 16505397133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505397131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22517229 + ... + 22517961.

It is an arithmetic number, because the mean of its divisors is an integer number (317405088).

Almost surely, 2^16505397135 is an apocalyptic number.

16505397135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16505397135 is a deficient number, since it is larger than the sum of its proper divisors (13965491313).

16505397135 is an equidigital number, since it uses as much as digits as its factorization.

16505397135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227 (or 1215 counting only the distinct ones).

The product of its (nonzero) digits is 425250, while the sum is 45.

The spelling of 16505397135 in words is "sixteen billion, five hundred five million, three hundred ninety-seven thousand, one hundred thirty-five".