660048813 has 6 divisors (see below), whose sum is σ = 953403854. Its totient is φ = 440032536.

The previous prime is 660048811. The next prime is 660048833. The reversal of 660048813 is 318840066.

It is a happy number.

660048813 is a `hidden beast` number, since 6 + 600 + 48 + 8 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 616131684 + 43917129 = 24822^2 + 6627^2 .

It is not a de Polignac number, because 660048813 - 2¹ = 660048811 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 (660048811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36669370 + ... + 36669387.

Almost surely, 2^660048813 is an apocalyptic number.

It is an amenable number.

660048813 is a deficient number, since it is larger than the sum of its proper divisors (293355041).

660048813 is a wasteful number, since it uses less digits than its factorization.

660048813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73338763 (or 73338760 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 660048813 is about 25691.4151614893. The cubic root of 660048813 is about 870.6802329652.

Adding to 660048813 its reverse (318840066), we get a palindrome (978888879).

The spelling of 660048813 in words is "six hundred sixty million, forty-eight thousand, eight hundred thirteen".