16939791785 has 16 divisors (see below), whose sum is σ = 23625475200. Its totient is φ = 11418976896.

The previous prime is 16939791769. The next prime is 16939791787. The reversal of 16939791785 is 58719793961.

It is a cyclic number.

It is not a de Polignac number, because 16939791785 - 2⁴ = 16939791769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16939791787) 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 15 ways as a sum of consecutive naturals, for example, 4099580 + ... + 4103709.

It is an arithmetic number, because the mean of its divisors is an integer number (1476592200).

Almost surely, 2^16939791785 is an apocalyptic number.

It is an amenable number.

16939791785 is a deficient number, since it is larger than the sum of its proper divisors (6685683415).

16939791785 is an equidigital number, since it uses as much as digits as its factorization.

16939791785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8203360.

The product of its digits is 25719120, while the sum is 65.

The spelling of 16939791785 in words is "sixteen billion, nine hundred thirty-nine million, seven hundred ninety-one thousand, seven hundred eighty-five".