660425271 has 16 divisors (see below), whose sum is σ = 991607808. Its totient is φ = 387345600.

The previous prime is 660425257. The next prime is 660425287. The reversal of 660425271 is 172524066.

It is not a de Polignac number, because 660425271 - 2⁵ = 660425239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660426271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321766 + ... + 323811.

It is an arithmetic number, because the mean of its divisors is an integer number (61975488).

Almost surely, 2^660425271 is an apocalyptic number.

660425271 is a deficient number, since it is larger than the sum of its proper divisors (331182537).

660425271 is a wasteful number, since it uses less digits than its factorization.

660425271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645622.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 660425271 is about 25698.7406500786. The cubic root of 660425271 is about 870.8457319592.

The spelling of 660425271 in words is "six hundred sixty million, four hundred twenty-five thousand, two hundred seventy-one".