216147725 has 12 divisors (see below), whose sum is σ = 268209396. Its totient is φ = 172798080.

The previous prime is 216147677. The next prime is 216147733. The reversal of 216147725 is 527741612.

It can be written as a sum of positive squares in 6 ways, for example, as 120538441 + 95609284 = 10979^2 + 9778^2 .

It is not a de Polignac number, because 216147725 - 2¹⁴ = 216131341 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58019 + ... + 61631.

It is an arithmetic number, because the mean of its divisors is an integer number (22350783).

Almost surely, 2^216147725 is an apocalyptic number.

216147725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216147725 is a deficient number, since it is larger than the sum of its proper divisors (52061671).

216147725 is a wasteful number, since it uses less digits than its factorization.

216147725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6016 (or 6011 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 216147725 is about 14701.9633042665. The cubic root of 216147725 is about 600.1367512369.

The spelling of 216147725 in words is "two hundred sixteen million, one hundred forty-seven thousand, seven hundred twenty-five".