16666694447 has 24 divisors (see below), whose sum is σ = 19895751456. Its totient is φ = 13850039808.

The previous prime is 16666694431. The next prime is 16666694453. The reversal of 16666694447 is 74449666661.

It is not a de Polignac number, because 16666694447 - 2⁴ = 16666694431 is a prime.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16666694047) 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 23 ways as a sum of consecutive naturals, for example, 10028 + ... + 182849.

It is an arithmetic number, because the mean of its divisors is an integer number (828989644).

Almost surely, 2^16666694447 is an apocalyptic number.

16666694447 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

16666694447 is a deficient number, since it is larger than the sum of its proper divisors (3229057009).

16666694447 is a wasteful number, since it uses less digits than its factorization.

16666694447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192947 (or 192930 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 59.

The spelling of 16666694447 in words is "sixteen billion, six hundred sixty-six million, six hundred ninety-four thousand, four hundred forty-seven".