16587288661 has 2 divisors, whose sum is σ = 16587288662. Its totient is φ = 16587288660.

The previous prime is 16587288647. The next prime is 16587288701. The reversal of 16587288661 is 16688278561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16500687025 + 86601636 = 128455^2 + 9306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16587288661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16587288596 and 16587288605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16587288631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8293644330 + 8293644331.

It is an arithmetic number, because the mean of its divisors is an integer number (8293644331).

Almost surely, 2^16587288661 is an apocalyptic number.

It is an amenable number.

16587288661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16587288661 is an equidigital number, since it uses as much as digits as its factorization.

16587288661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7741440, while the sum is 58.

The spelling of 16587288661 in words is "sixteen billion, five hundred eighty-seven million, two hundred eighty-eight thousand, six hundred sixty-one".