216439939825 has 24 divisors (see below), whose sum is σ = 269966649600. Its totient is φ = 172132464960.

The previous prime is 216439939823. The next prime is 216439939871. The reversal of 216439939825 is 528939934612.

216439939825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216439939825 - 2¹ = 216439939823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216439939823) 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, 22473111 + ... + 22482739.

It is an arithmetic number, because the mean of its divisors is an integer number (11248610400).

Almost surely, 2^216439939825 is an apocalyptic number.

216439939825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216439939825 is a deficient number, since it is larger than the sum of its proper divisors (53526709775).

216439939825 is a wasteful number, since it uses less digits than its factorization.

216439939825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14841 (or 14836 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 61.

The spelling of 216439939825 in words is "two hundred sixteen billion, four hundred thirty-nine million, nine hundred thirty-nine thousand, eight hundred twenty-five".