16945409805 has 16 divisors (see below), whose sum is σ = 27127955904. Its totient is φ = 9032451840.

The previous prime is 16945409801. The next prime is 16945409837. The reversal of 16945409805 is 50890454961.

It is not a de Polignac number, because 16945409805 - 2² = 16945409801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16945409801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 291211 + ... + 344520.

It is an arithmetic number, because the mean of its divisors is an integer number (1695497244).

Almost surely, 2^16945409805 is an apocalyptic number.

16945409805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16945409805 is a deficient number, since it is larger than the sum of its proper divisors (10182546099).

16945409805 is a wasteful number, since it uses less digits than its factorization.

16945409805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637516.

The product of its (nonzero) digits is 1555200, while the sum is 51.

The spelling of 16945409805 in words is "sixteen billion, nine hundred forty-five million, four hundred nine thousand, eight hundred five".