16687749511 has 4 divisors (see below), whose sum is σ = 16730649000. Its totient is φ = 16644850024.

The previous prime is 16687749503. The next prime is 16687749523. The reversal of 16687749511 is 11594778661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16687749511 - 2³ = 16687749503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16687749541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21449161 + ... + 21449938.

It is an arithmetic number, because the mean of its divisors is an integer number (4182662250).

Almost surely, 2^16687749511 is an apocalyptic number.

16687749511 is a deficient number, since it is larger than the sum of its proper divisors (42899489).

16687749511 is an equidigital number, since it uses as much as digits as its factorization.

16687749511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42899488.

The product of its digits is 2540160, while the sum is 55.

The spelling of 16687749511 in words is "sixteen billion, six hundred eighty-seven million, seven hundred forty-nine thousand, five hundred eleven".