71666125 has 8 divisors (see below), whose sum is σ = 89439480. Its totient is φ = 57332800.

The previous prime is 71666113. The next prime is 71666159. The reversal of 71666125 is 52166617.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8590761 + 63075364 = 2931^2 + 7942^2 .

It is not a de Polignac number, because 71666125 - 2¹¹ = 71664077 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286540 + ... + 286789.

It is an arithmetic number, because the mean of its divisors is an integer number (11179935).

Almost surely, 2^71666125 is an apocalyptic number.

It is an amenable number.

71666125 is a deficient number, since it is larger than the sum of its proper divisors (17773355).

71666125 is an equidigital number, since it uses as much as digits as its factorization.

71666125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573344 (or 573334 counting only the distinct ones).

The product of its digits is 15120, while the sum is 34.

The square root of 71666125 is about 8465.5847405835. The cubic root of 71666125 is about 415.3727236448.

It can be divided in two parts, 7166612 and 5, that added together give a palindrome (7166617).

The spelling of 71666125 in words is "seventy-one million, six hundred sixty-six thousand, one hundred twenty-five".