660605263 has 4 divisors (see below), whose sum is σ = 660791520. Its totient is φ = 660419008.

The previous prime is 660605249. The next prime is 660605269. The reversal of 660605263 is 362506066.

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 660605263 - 2²¹ = 658508111 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 (660605269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87703 + ... + 94936.

It is an arithmetic number, because the mean of its divisors is an integer number (165197880).

Almost surely, 2^660605263 is an apocalyptic number.

660605263 is a deficient number, since it is larger than the sum of its proper divisors (186257).

660605263 is a wasteful number, since it uses less digits than its factorization.

660605263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186256.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 660605263 is about 25702.2423729915. The cubic root of 660605263 is about 870.9248380717.

The spelling of 660605263 in words is "six hundred sixty million, six hundred five thousand, two hundred sixty-three".