16997761649 has 6 divisors (see below), whose sum is σ = 18683490210. Its totient is φ = 15452510480.

The previous prime is 16997761639. The next prime is 16997761657. The reversal of 16997761649 is 94616779961.

16997761649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 14975640625 + 2022121024 = 122375^2 + 44968^2 .

It is not a de Polignac number, because 16997761649 - 2¹⁶ = 16997696113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16997761609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70238564 + ... + 70238805.

It is an arithmetic number, because the mean of its divisors is an integer number (3113915035).

Almost surely, 2^16997761649 is an apocalyptic number.

It is an amenable number.

16997761649 is a deficient number, since it is larger than the sum of its proper divisors (1685728561).

16997761649 is a wasteful number, since it uses less digits than its factorization.

16997761649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140477391 (or 140477380 counting only the distinct ones).

The product of its digits is 30862944, while the sum is 65.

The spelling of 16997761649 in words is "sixteen billion, nine hundred ninety-seven million, seven hundred sixty-one thousand, six hundred forty-nine".