16631530631161 has 4 divisors (see below), whose sum is σ = 16657000050852. Its totient is φ = 16606061211472.

The previous prime is 16631530631147. The next prime is 16631530631207. The reversal of 16631530631161 is 16113603513661.

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 8731670403600 + 7899860227561 = 2954940^2 + 2810669^2 .

It is a cyclic number.

It is not a de Polignac number, because 16631530631161 - 2⁴¹ = 14432507375609 is a prime.

It is a super-2 number, since 2×16631530631161² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16631530632161) 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, 12734708866 + ... + 12734710171.

It is an arithmetic number, because the mean of its divisors is an integer number (4164250012713).

Almost surely, 2^{16631530631161} is an apocalyptic number.

It is an amenable number.

16631530631161 is a deficient number, since it is larger than the sum of its proper divisors (25469419691).

16631530631161 is an equidigital number, since it uses as much as digits as its factorization.

16631530631161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25469419690.

The product of its (nonzero) digits is 174960, while the sum is 43.

The spelling of 16631530631161 in words is "sixteen trillion, six hundred thirty-one billion, five hundred thirty million, six hundred thirty-one thousand, one hundred sixty-one".