660634253 has 4 divisors (see below), whose sum is σ = 664284348. Its totient is φ = 656984160.

The previous prime is 660634217. The next prime is 660634277. The reversal of 660634253 is 352436066.

660634253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17656804 + 642977449 = 4202^2 + 25357^2 .

It is a cyclic number.

It is not a de Polignac number, because 660634253 - 2²⁴ = 643857037 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 (660634213) 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, 1824776 + ... + 1825137.

It is an arithmetic number, because the mean of its divisors is an integer number (166071087).

Almost surely, 2^660634253 is an apocalyptic number.

It is an amenable number.

660634253 is a deficient number, since it is larger than the sum of its proper divisors (3650095).

660634253 is a wasteful number, since it uses less digits than its factorization.

660634253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3650094.

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

The square root of 660634253 is about 25702.8063253801. The cubic root of 660634253 is about 870.9375777733.

The spelling of 660634253 in words is "six hundred sixty million, six hundred thirty-four thousand, two hundred fifty-three".