16523980111 has 4 divisors (see below), whose sum is σ = 16531047000. Its totient is φ = 16516913224.

The previous prime is 16523980103. The next prime is 16523980157. The reversal of 16523980111 is 11108932561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11108932561 = 60589 ⋅183349.

It is a cyclic number.

It is not a de Polignac number, because 16523980111 - 2³ = 16523980103 is a prime.

It is a super-3 number, since 3×16523980111³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16523980171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3529936 + ... + 3534613.

It is an arithmetic number, because the mean of its divisors is an integer number (4132761750).

Almost surely, 2^16523980111 is an apocalyptic number.

16523980111 is a deficient number, since it is larger than the sum of its proper divisors (7066889).

16523980111 is an equidigital number, since it uses as much as digits as its factorization.

16523980111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7066888.

The product of its (nonzero) digits is 12960, while the sum is 37.

It can be divided in two parts, 165239 and 80111, that added together give a triangular number (245350 = T₇₀₀).

The spelling of 16523980111 in words is "sixteen billion, five hundred twenty-three million, nine hundred eighty thousand, one hundred eleven".