16081535591 has 32 divisors (see below), whose sum is σ = 18040470336. Its totient is φ = 14212224000.

The previous prime is 16081535567. The next prime is 16081535593. The reversal of 16081535591 is 19553518061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16081535591 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16081535593) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30866411 + ... + 30866931.

It is an arithmetic number, because the mean of its divisors is an integer number (563764698).

Almost surely, 2^16081535591 is an apocalyptic number.

16081535591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16081535591 is a deficient number, since it is larger than the sum of its proper divisors (1958934745).

16081535591 is a wasteful number, since it uses less digits than its factorization.

16081535591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043.

The product of its (nonzero) digits is 162000, while the sum is 44.

The spelling of 16081535591 in words is "sixteen billion, eighty-one million, five hundred thirty-five thousand, five hundred ninety-one".