216775025 has 12 divisors (see below), whose sum is σ = 268983900. Its totient is φ = 173302080.

The previous prime is 216775021. The next prime is 216775037. The reversal of 216775025 is 520577612.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 13512976 + 203262049 = 3676^2 + 14257^2 .

It is not a de Polignac number, because 216775025 - 2² = 216775021 is a prime.

It is a super-2 number, since 2×216775025² = 93982822927501250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (216775021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68171 + ... + 71279.

It is an arithmetic number, because the mean of its divisors is an integer number (22415325).

Almost surely, 2^216775025 is an apocalyptic number.

216775025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216775025 is a deficient number, since it is larger than the sum of its proper divisors (52208875).

216775025 is a wasteful number, since it uses less digits than its factorization.

216775025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5908 (or 5903 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 216775025 is about 14723.2817333637. The cubic root of 216775025 is about 600.7167591603.

The spelling of 216775025 in words is "two hundred sixteen million, seven hundred seventy-five thousand, twenty-five".