29139947666 has 8 divisors (see below), whose sum is σ = 43951413324. Its totient is φ = 14489476560.

The previous prime is 29139947657. The next prime is 29139947713. The reversal of 29139947666 is 66674993192.

It can be written as a sum of positive squares in 2 ways, for example, as 18811494025 + 10328453641 = 137155^2 + 101629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 29139947599 and 29139947608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40248185 + ... + 40248908.

Almost surely, 2^29139947666 is an apocalyptic number.

29139947666 is a deficient number, since it is larger than the sum of its proper divisors (14811465658).

29139947666 is a wasteful number, since it uses less digits than its factorization.

29139947666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80497276.

The product of its digits is 26453952, while the sum is 62.

The spelling of 29139947666 in words is "twenty-nine billion, one hundred thirty-nine million, nine hundred forty-seven thousand, six hundred sixty-six".