16630687861 has 2 divisors, whose sum is σ = 16630687862. Its totient is φ = 16630687860.

The previous prime is 16630687817. The next prime is 16630687873. The reversal of 16630687861 is 16878603661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11442366961 + 5188320900 = 106969^2 + 72030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16630687861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16630687799 and 16630687808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16630687811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8315343930 + 8315343931.

It is an arithmetic number, because the mean of its divisors is an integer number (8315343931).

Almost surely, 2^16630687861 is an apocalyptic number.

It is an amenable number.

16630687861 is a deficient number, since it is larger than the sum of its proper divisors (1).

16630687861 is an equidigital number, since it uses as much as digits as its factorization.

16630687861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 16630687861 in words is "sixteen billion, six hundred thirty million, six hundred eighty-seven thousand, eight hundred sixty-one".