16537045591 has 4 divisors (see below), whose sum is σ = 18040413384. Its totient is φ = 15033677800.

The previous prime is 16537045537. The next prime is 16537045601. The reversal of 16537045591 is 19554073561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19554073561 = 11 ⋅1777643051.

It is a cyclic number.

It is not a de Polignac number, because 16537045591 - 2¹¹ = 16537043543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16537045691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 751683880 + ... + 751683901.

It is an arithmetic number, because the mean of its divisors is an integer number (4510103346).

Almost surely, 2^16537045591 is an apocalyptic number.

16537045591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16537045591 is a deficient number, since it is larger than the sum of its proper divisors (1503367793).

16537045591 is a wasteful number, since it uses less digits than its factorization.

16537045591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503367792.

The product of its (nonzero) digits is 567000, while the sum is 46.

The spelling of 16537045591 in words is "sixteen billion, five hundred thirty-seven million, forty-five thousand, five hundred ninety-one".