16681986527 has 2 divisors, whose sum is σ = 16681986528. Its totient is φ = 16681986526.

The previous prime is 16681986523. The next prime is 16681986533. The reversal of 16681986527 is 72568918661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (72568918661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16681986527 - 2² = 16681986523 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16681986523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340993263 + 8340993264.

It is an arithmetic number, because the mean of its divisors is an integer number (8340993264).

Almost surely, 2^16681986527 is an apocalyptic number.

16681986527 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681986527 is an equidigital number, since it uses as much as digits as its factorization.

16681986527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 59.

The spelling of 16681986527 in words is "sixteen billion, six hundred eighty-one million, nine hundred eighty-six thousand, five hundred twenty-seven".