16631554717 has 2 divisors, whose sum is σ = 16631554718. Its totient is φ = 16631554716.

The previous prime is 16631554609. The next prime is 16631554721. The reversal of 16631554717 is 71745513661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15308123076 + 1323431641 = 123726^2 + 36379^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16631554717 is a prime.

It is a super-2 number, since 2×16631554717² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16631554517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8315777358 + 8315777359.

It is an arithmetic number, because the mean of its divisors is an integer number (8315777359).

Almost surely, 2^16631554717 is an apocalyptic number.

It is an amenable number.

16631554717 is a deficient number, since it is larger than the sum of its proper divisors (1).

16631554717 is an equidigital number, since it uses as much as digits as its factorization.

16631554717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 46.

The spelling of 16631554717 in words is "sixteen billion, six hundred thirty-one million, five hundred fifty-four thousand, seven hundred seventeen".