660001263 has 8 divisors (see below), whose sum is σ = 881205168. Its totient is φ = 439399104.

The previous prime is 660001193. The next prime is 660001283. The reversal of 660001263 is 362100066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 660001263 - 2¹⁰ = 660000239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660001283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147870 + ... + 152267.

It is an arithmetic number, because the mean of its divisors is an integer number (110150646).

Almost surely, 2^660001263 is an apocalyptic number.

660001263 is a deficient number, since it is larger than the sum of its proper divisors (221203905).

660001263 is a wasteful number, since it uses less digits than its factorization.

660001263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300873.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 660001263 is about 25690.4897384227. The cubic root of 660001263 is about 870.6593244918.

The spelling of 660001263 in words is "six hundred sixty million, one thousand, two hundred sixty-three".