660561053 has 4 divisors (see below), whose sum is σ = 662006940. Its totient is φ = 659115168.

The previous prime is 660561047. The next prime is 660561059. The reversal of 660561053 is 350165066.

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

It is an interprime number because it is at equal distance from previous prime (660561047) and next prime (660561059).

It can be written as a sum of positive squares in 2 ways, for example, as 632120164 + 28440889 = 25142^2 + 5333^2 .

It is a cyclic number.

It is not a de Polignac number, because 660561053 - 2¹⁰ = 660560029 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 (660561059) 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 3 ways as a sum of consecutive naturals, for example, 722258 + ... + 723171.

It is an arithmetic number, because the mean of its divisors is an integer number (165501735).

Almost surely, 2^660561053 is an apocalyptic number.

It is an amenable number.

660561053 is a deficient number, since it is larger than the sum of its proper divisors (1445887).

660561053 is a wasteful number, since it uses less digits than its factorization.

660561053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1445886.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 660561053 is about 25701.3823169105. The cubic root of 660561053 is about 870.9054091994.

The spelling of 660561053 in words is "six hundred sixty million, five hundred sixty-one thousand, fifty-three".