660643053 has 64 divisors (see below), whose sum is σ = 1114460160. Its totient is φ = 339406848.

The previous prime is 660643051. The next prime is 660643063. The reversal of 660643053 is 350346066.

It is a happy number.

It is not a de Polignac number, because 660643053 - 2¹ = 660643051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660643051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1770975 + ... + 1771347.

It is an arithmetic number, because the mean of its divisors is an integer number (17413440).

Almost surely, 2^660643053 is an apocalyptic number.

It is an amenable number.

660643053 is a deficient number, since it is larger than the sum of its proper divisors (453817107).

660643053 is a wasteful number, since it uses less digits than its factorization.

660643053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618.

The product of its (nonzero) digits is 38880, while the sum is 33.

The square root of 660643053 is about 25702.9775123428. The cubic root of 660643053 is about 870.9414448736.

The spelling of 660643053 in words is "six hundred sixty million, six hundred forty-three thousand, fifty-three".