16616111491 has 16 divisors (see below), whose sum is σ = 20119409856. Its totient is φ = 13396248576.

The previous prime is 16616111459. The next prime is 16616111509. The reversal of 16616111491 is 19411161661.

It is a cyclic number.

It is not a de Polignac number, because 16616111491 - 2⁵ = 16616111459 is a prime.

It is a super-2 number, since 2×16616111491² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16616111491.

It is not an unprimeable number, because it can be changed into a prime (16616114491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152155 + ... + 237451.

It is an arithmetic number, because the mean of its divisors is an integer number (1257463116).

Almost surely, 2^16616111491 is an apocalyptic number.

16616111491 is a deficient number, since it is larger than the sum of its proper divisors (3503298365).

16616111491 is a wasteful number, since it uses less digits than its factorization.

16616111491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86958.

The product of its digits is 7776, while the sum is 37.

The spelling of 16616111491 in words is "sixteen billion, six hundred sixteen million, one hundred eleven thousand, four hundred ninety-one".