16539745815 has 24 divisors (see below), whose sum is σ = 28679610960. Its totient is φ = 8817899904.

The previous prime is 16539745811. The next prime is 16539745823. The reversal of 16539745815 is 51854793561.

16539745815 is a `hidden beast` number, since 1 + 6 + 53 + 9 + 7 + 4 + 581 + 5 = 666.

It is not a de Polignac number, because 16539745815 - 2² = 16539745811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16539745811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55464 + ... + 190146.

It is an arithmetic number, because the mean of its divisors is an integer number (1194983790).

Almost surely, 2^16539745815 is an apocalyptic number.

16539745815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16539745815 is a deficient number, since it is larger than the sum of its proper divisors (12139865145).

16539745815 is a wasteful number, since it uses less digits than its factorization.

16539745815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137423 (or 137420 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 54.

The spelling of 16539745815 in words is "sixteen billion, five hundred thirty-nine million, seven hundred forty-five thousand, eight hundred fifteen".