660140533 has 18 divisors (see below), whose sum is σ = 725741766. Its totient is φ = 600193152.

The previous prime is 660140527. The next prime is 660140563. The reversal of 660140533 is 335041066.

It can be written as a sum of positive squares in 9 ways, for example, as 98545329 + 561595204 = 9927^2 + 23698^2 .

It is not a de Polignac number, because 660140533 - 2²⁵ = 626586101 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 (660140563) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 900235 + ... + 900967.

It is an arithmetic number, because the mean of its divisors is an integer number (40318987).

Almost surely, 2^660140533 is an apocalyptic number.

It is an amenable number.

660140533 is a deficient number, since it is larger than the sum of its proper divisors (65601233).

660140533 is an equidigital number, since it uses as much as digits as its factorization.

660140533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 660140533 is about 25693.2001315523. The cubic root of 660140533 is about 870.7205608373.

Adding to 660140533 its reverse (335041066), we get a palindrome (995181599).

The spelling of 660140533 in words is "six hundred sixty million, one hundred forty thousand, five hundred thirty-three".