217491200825 has 12 divisors (see below), whose sum is σ = 273102877440. Its totient is φ = 171790516560.

The previous prime is 217491200821. The next prime is 217491200827. The reversal of 217491200825 is 528002194712.

It is not a de Polignac number, because 217491200825 - 2² = 217491200821 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217491200821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55059089 + ... + 55063038.

It is an arithmetic number, because the mean of its divisors is an integer number (22758573120).

Almost surely, 2^217491200825 is an apocalyptic number.

217491200825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

217491200825 is a deficient number, since it is larger than the sum of its proper divisors (55611676615).

217491200825 is a wasteful number, since it uses less digits than its factorization.

217491200825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110122216 (or 110122211 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 217491200825 in words is "two hundred seventeen billion, four hundred ninety-one million, two hundred thousand, eight hundred twenty-five".