515661161100 has 72 divisors (see below), whose sum is σ = 1497289406928. Its totient is φ = 137020262400.

The previous prime is 515661161089. The next prime is 515661161107. The reversal of 515661161100 is 1161166515.

It is not an unprimeable number, because it can be changed into a prime (515661161107) 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 23 ways as a sum of consecutive naturals, for example, 2974189 + ... + 3142788.

Almost surely, 2^515661161100 is an apocalyptic number.

515661161100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

515661161100 is an abundant number, since it is smaller than the sum of its proper divisors (981628245828).

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

515661161100 is a wasteful number, since it uses less digits than its factorization.

515661161100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6117275 (or 6117268 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 515661161100 in words is "five hundred fifteen billion, six hundred sixty-one million, one hundred sixty-one thousand, one hundred".