660534263 has 12 divisors (see below), whose sum is σ = 693532560. Its totient is φ = 629103728.

The previous prime is 660534253. The next prime is 660534293. The reversal of 660534263 is 362435066.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 660534263 - 2¹⁰ = 660533239 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 (660534233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2834795 + ... + 2835027.

It is an arithmetic number, because the mean of its divisors is an integer number (57794380).

Almost surely, 2^660534263 is an apocalyptic number.

660534263 is a deficient number, since it is larger than the sum of its proper divisors (32998297).

660534263 is an frugal number, since it uses more digits than its factorization.

With its successor (660534264) it forms an eRAP, since the sums of their prime factors are consecutive (535 and 536).

660534263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 35.

The square root of 660534263 is about 25700.8611334329. The cubic root of 660534263 is about 870.8936354346.

The spelling of 660534263 in words is "six hundred sixty million, five hundred thirty-four thousand, two hundred sixty-three".