660873671 has 4 divisors (see below), whose sum is σ = 662346000. Its totient is φ = 659401344.

The previous prime is 660873643. The next prime is 660873677. The reversal of 660873671 is 176378066.

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 660873671 - 2¹⁰ = 660872647 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 (660873677) 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, 735491 + ... + 736388.

It is an arithmetic number, because the mean of its divisors is an integer number (165586500).

Almost surely, 2^660873671 is an apocalyptic number.

660873671 is a deficient number, since it is larger than the sum of its proper divisors (1472329).

660873671 is a wasteful number, since it uses less digits than its factorization.

660873671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472328.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 660873671 is about 25707.4633326589. The cubic root of 660873671 is about 871.0427761478.

The spelling of 660873671 in words is "six hundred sixty million, eight hundred seventy-three thousand, six hundred seventy-one".