16918791919 has 4 divisors (see below), whose sum is σ = 16920217440. Its totient is φ = 16917366400.

The previous prime is 16918791913. The next prime is 16918791931. The reversal of 16918791919 is 91919781961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91919781961 = 7 ⋅13131397423.

It is a cyclic number.

It is not a de Polignac number, because 16918791919 - 2²⁵ = 16885237487 is a prime.

It is a super-2 number, since 2×16918791919² (a number of 21 digits) contains 22 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 (16918791913) 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, 694807 + ... + 718744.

It is an arithmetic number, because the mean of its divisors is an integer number (4230054360).

Almost surely, 2^16918791919 is an apocalyptic number.

16918791919 is a deficient number, since it is larger than the sum of its proper divisors (1425521).

16918791919 is a wasteful number, since it uses less digits than its factorization.

16918791919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425520.

The product of its digits is 2204496, while the sum is 61.

The spelling of 16918791919 in words is "sixteen billion, nine hundred eighteen million, seven hundred ninety-one thousand, nine hundred nineteen".