16761320807649 has 32 divisors (see below), whose sum is σ = 25088804987904. Its totient is φ = 9864175423680.

The previous prime is 16761320807641. The next prime is 16761320807677. The reversal of 16761320807649 is 94670802316761.

It is not a de Polignac number, because 16761320807649 - 2³ = 16761320807641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16761320807592 and 16761320807601.

It is not an unprimeable number, because it can be changed into a prime (16761320807641) 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 31 ways as a sum of consecutive naturals, for example, 13031499 + ... + 14259824.

It is an arithmetic number, because the mean of its divisors is an integer number (784025155872).

Almost surely, 2^{16761320807649} is an apocalyptic number.

It is an amenable number.

16761320807649 is a deficient number, since it is larger than the sum of its proper divisors (8327484180255).

16761320807649 is a wasteful number, since it uses less digits than its factorization.

16761320807649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27291877.

The product of its (nonzero) digits is 18289152, while the sum is 60.

The spelling of 16761320807649 in words is "sixteen trillion, seven hundred sixty-one billion, three hundred twenty million, eight hundred seven thousand, six hundred forty-nine".