660525071 has 4 divisors (see below), whose sum is σ = 660937200. Its totient is φ = 660112944.

The previous prime is 660525053. The next prime is 660525079. The reversal of 660525071 is 170525066.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660525071 - 2¹⁰ = 660524047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660525079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203651 + ... + 206868.

It is an arithmetic number, because the mean of its divisors is an integer number (165234300).

Almost surely, 2^660525071 is an apocalyptic number.

660525071 is a deficient number, since it is larger than the sum of its proper divisors (412129).

660525071 is a wasteful number, since it uses less digits than its factorization.

660525071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412128.

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

The square root of 660525071 is about 25700.6823061179. The cubic root of 660525071 is about 870.8895956283.

The spelling of 660525071 in words is "six hundred sixty million, five hundred twenty-five thousand, seventy-one".