16976809561 has 2 divisors, whose sum is σ = 16976809562. Its totient is φ = 16976809560.

The previous prime is 16976809537. The next prime is 16976809601. The reversal of 16976809561 is 16590867961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15312577536 + 1664232025 = 123744^2 + 40795^2 .

It is a cyclic number.

It is not a de Polignac number, because 16976809561 - 2¹¹ = 16976807513 is a prime.

It is a super-2 number, since 2×16976809561² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16976809496 and 16976809505.

It is not a weakly prime, because it can be changed into another prime (16976809261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8488404780 + 8488404781.

It is an arithmetic number, because the mean of its divisors is an integer number (8488404781).

Almost surely, 2^16976809561 is an apocalyptic number.

It is an amenable number.

16976809561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16976809561 is an equidigital number, since it uses as much as digits as its factorization.

16976809561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4898880, while the sum is 58.

The spelling of 16976809561 in words is "sixteen billion, nine hundred seventy-six million, eight hundred nine thousand, five hundred sixty-one".