16513126543997 has 12 divisors (see below), whose sum is σ = 17638540890516. Its totient is φ = 15455899998720.

The previous prime is 16513126543987. The next prime is 16513126544017. The reversal of 16513126543997 is 79934562131561.

It can be written as a sum of positive squares in 6 ways, for example, as 622491018361 + 15890635525636 = 788981^2 + 3986306^2 .

It is not a de Polignac number, because 16513126543997 - 2⁶ = 16513126543933 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 (16513126543957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157789808 + ... + 157894425.

It is an arithmetic number, because the mean of its divisors is an integer number (1469878407543).

Almost surely, 2^{16513126543997} is an apocalyptic number.

16513126543997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16513126543997 is a deficient number, since it is larger than the sum of its proper divisors (1125414346519).

16513126543997 is a wasteful number, since it uses less digits than its factorization.

16513126543997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315684448 (or 315684431 counting only the distinct ones).

The product of its digits is 36741600, while the sum is 62.

The spelling of 16513126543997 in words is "sixteen trillion, five hundred thirteen billion, one hundred twenty-six million, five hundred forty-three thousand, nine hundred ninety-seven".