513561012435666 has 96 divisors (see below), whose sum is σ = 1247310517602240. Its totient is φ = 157431342153024.

The previous prime is 513561012435641. The next prime is 513561012435677. The reversal of 513561012435666 is 666534210165315.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149388520 + ... + 152787603.

It is an arithmetic number, because the mean of its divisors is an integer number (12992817891690).

Almost surely, 2^{513561012435666} is an apocalyptic number.

513561012435666 is an abundant number, since it is smaller than the sum of its proper divisors (733749505166574).

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

513561012435666 is a wasteful number, since it uses less digits than its factorization.

513561012435666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302176422 (or 302176410 counting only the distinct ones).

The product of its (nonzero) digits is 11664000, while the sum is 54.

The spelling of 513561012435666 in words is "five hundred thirteen trillion, five hundred sixty-one billion, twelve million, four hundred thirty-five thousand, six hundred sixty-six".