71665025 has 24 divisors (see below), whose sum is σ = 92851200. Its totient is φ = 54806400.

The previous prime is 71665021. The next prime is 71665051. The reversal of 71665025 is 52056617.

It is a happy number.

It is not a de Polignac number, because 71665025 - 2² = 71665021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71664982 and 71665000.

It is not an unprimeable number, because it can be changed into a prime (71665021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68456 + ... + 69494.

It is an arithmetic number, because the mean of its divisors is an integer number (3868800).

Almost surely, 2^71665025 is an apocalyptic number.

It is an amenable number.

71665025 is a deficient number, since it is larger than the sum of its proper divisors (21186175).

71665025 is a wasteful number, since it uses less digits than its factorization.

71665025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1169 (or 1164 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 71665025 is about 8465.5197714021. The cubic root of 71665025 is about 415.3705984551.

The spelling of 71665025 in words is "seventy-one million, six hundred sixty-five thousand, twenty-five".