16216691287 has 2 divisors, whose sum is σ = 16216691288. Its totient is φ = 16216691286.

The previous prime is 16216691269. The next prime is 16216691291. The reversal of 16216691287 is 78219661261.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16216691287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16216691287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16216691237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8108345643 + 8108345644.

It is an arithmetic number, because the mean of its divisors is an integer number (8108345644).

Almost surely, 2^16216691287 is an apocalyptic number.

16216691287 is a deficient number, since it is larger than the sum of its proper divisors (1).

16216691287 is an equidigital number, since it uses as much as digits as its factorization.

16216691287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 49.

The spelling of 16216691287 in words is "sixteen billion, two hundred sixteen million, six hundred ninety-one thousand, two hundred eighty-seven".