16445648775 has 24 divisors (see below), whose sum is σ = 27195223680. Its totient is φ = 8769372640.

The previous prime is 16445648771. The next prime is 16445648789. The reversal of 16445648775 is 57784654461.

It is not a de Polignac number, because 16445648775 - 2² = 16445648771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16445648771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 456886 + ... + 491564.

It is an arithmetic number, because the mean of its divisors is an integer number (1133134320).

Almost surely, 2^16445648775 is an apocalyptic number.

16445648775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

16445648775 is a deficient number, since it is larger than the sum of its proper divisors (10749574905).

16445648775 is a wasteful number, since it uses less digits than its factorization.

16445648775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41015 (or 41010 counting only the distinct ones).

The product of its digits is 22579200, while the sum is 57.

The spelling of 16445648775 in words is "sixteen billion, four hundred forty-five million, six hundred forty-eight thousand, seven hundred seventy-five".