16513126543994 has 4 divisors (see below), whose sum is σ = 24769689815994. Its totient is φ = 8256563271996.

The previous prime is 16513126543987. The next prime is 16513126544017. The reversal of 16513126543994 is 49934562131561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10565990788369 + 5947135755625 = 3250537^2 + 2438675^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4128281635997 + ... + 4128281636000.

Almost surely, 2^{16513126543994} is an apocalyptic number.

16513126543994 is a deficient number, since it is larger than the sum of its proper divisors (8256563272000).

16513126543994 is an equidigital number, since it uses as much as digits as its factorization.

16513126543994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8256563271999.

The product of its digits is 20995200, while the sum is 59.

The spelling of 16513126543994 in words is "sixteen trillion, five hundred thirteen billion, one hundred twenty-six million, five hundred forty-three thousand, nine hundred ninety-four".