16666254891 has 96 divisors (see below), whose sum is σ = 28838654208. Its totient is φ = 9141707520.

The previous prime is 16666254883. The next prime is 16666254907. The reversal of 16666254891 is 19845266661.

It is not a de Polignac number, because 16666254891 - 2³ = 16666254883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16666254821) 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 95 ways as a sum of consecutive naturals, for example, 29921185 + ... + 29921741.

It is an arithmetic number, because the mean of its divisors is an integer number (300402648).

Almost surely, 2^16666254891 is an apocalyptic number.

16666254891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16666254891 is a deficient number, since it is larger than the sum of its proper divisors (12172399317).

16666254891 is a wasteful number, since it uses less digits than its factorization.

16666254891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001 (or 998 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 16666254891 in words is "sixteen billion, six hundred sixty-six million, two hundred fifty-four thousand, eight hundred ninety-one".