515561868 has 48 divisors (see below), whose sum is σ = 1379768320. Its totient is φ = 166309200.

The previous prime is 515561861. The next prime is 515561911. The reversal of 515561868 is 868165515.

515561868 is a `hidden beast` number, since 5 + 1 + 5 + 561 + 86 + 8 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (515561861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73648 + ... + 80343.

Almost surely, 2^515561868 is an apocalyptic number.

It is an amenable number.

515561868 is an abundant number, since it is smaller than the sum of its proper divisors (864206452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

515561868 is a wasteful number, since it uses less digits than its factorization.

515561868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154035 (or 154027 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The square root of 515561868 is about 22705.9874922893. The cubic root of 515561868 is about 801.8508542044.

The spelling of 515561868 in words is "five hundred fifteen million, five hundred sixty-one thousand, eight hundred sixty-eight".