211664425 has 24 divisors (see below), whose sum is σ = 300526400. Its totient is φ = 144866880.

The previous prime is 211664413. The next prime is 211664441. The reversal of 211664425 is 524466112.

It is a happy number.

It is not a de Polignac number, because 211664425 - 2⁵ = 211664393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 144346 + ... + 145804.

Almost surely, 2^211664425 is an apocalyptic number.

211664425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211664425 is a deficient number, since it is larger than the sum of its proper divisors (88861975).

211664425 is a wasteful number, since it uses less digits than its factorization.

211664425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305 (or 2300 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 211664425 is about 14548.6915219205. The cubic root of 211664425 is about 595.9584158260.

The spelling of 211664425 in words is "two hundred eleven million, six hundred sixty-four thousand, four hundred twenty-five".