16661031727537 has 4 divisors (see below), whose sum is σ = 16661045584116. Its totient is φ = 16661017870960.

The previous prime is 16661031727519. The next prime is 16661031727559. The reversal of 16661031727537 is 73572713016661.

16661031727537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6326150553856 + 10334881173681 = 2515184^2 + 3214791^2 .

It is a cyclic number.

It is not a de Polignac number, because 16661031727537 - 2³¹ = 16658884243889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661031727597) 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, 4933198 + ... + 7593319.

It is an arithmetic number, because the mean of its divisors is an integer number (4165261396029).

Almost surely, 2^{16661031727537} is an apocalyptic number.

It is an amenable number.

16661031727537 is a deficient number, since it is larger than the sum of its proper divisors (13856579).

16661031727537 is a wasteful number, since it uses less digits than its factorization.

16661031727537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13856578.

The product of its (nonzero) digits is 6667920, while the sum is 55.

The spelling of 16661031727537 in words is "sixteen trillion, six hundred sixty-one billion, thirty-one million, seven hundred twenty-seven thousand, five hundred thirty-seven".