16191222885 has 24 divisors (see below), whose sum is σ = 28087570680. Its totient is φ = 8628308352.

The previous prime is 16191222877. The next prime is 16191222937. The reversal of 16191222885 is 58822219161.

16191222885 is a `hidden beast` number, since 1 + 619 + 1 + 2 + 2 + 28 + 8 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7612388001 + 8578834884 = 87249^2 + 92622^2 .

It is not a de Polignac number, because 16191222885 - 2³ = 16191222877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16191222885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89770 + ... + 201099.

It is an arithmetic number, because the mean of its divisors is an integer number (1170315445).

Almost surely, 2^16191222885 is an apocalyptic number.

16191222885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16191222885 is a deficient number, since it is larger than the sum of its proper divisors (11896347795).

16191222885 is a wasteful number, since it uses less digits than its factorization.

16191222885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292117 (or 292114 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The spelling of 16191222885 in words is "sixteen billion, one hundred ninety-one million, two hundred twenty-two thousand, eight hundred eighty-five".