16631455369 has 9 divisors (see below), whose sum is σ = 17228603847. Its totient is φ = 16054345944.

The previous prime is 16631455361. The next prime is 16631455381. The reversal of 16631455369 is 96355413661.

The square root of 16631455369 is 128963.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8721131769 + 7910323600 = 93387^2 + 88940^2 .

It is not a de Polignac number, because 16631455369 - 2³ = 16631455361 is a prime.

It is a super-2 number, since 2×16631455369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16631455361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3737704 + ... + 3742150.

Almost surely, 2^16631455369 is an apocalyptic number.

16631455369 is the 128963-rd square number.

16631455369 is the 64482-nd centered octagonal number.

It is an amenable number.

16631455369 is a deficient number, since it is larger than the sum of its proper divisors (597148478).

16631455369 is an frugal number, since it uses more digits than its factorization.

16631455369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8952 (or 4476 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 49.

Multiplying 16631455369 by its sum of digits (49), we get a square (814941313081 = 902741²).

The spelling of 16631455369 in words is "sixteen billion, six hundred thirty-one million, four hundred fifty-five thousand, three hundred sixty-nine".