516561611 has 4 divisors (see below), whose sum is σ = 516623592. Its totient is φ = 516499632.

The previous prime is 516561599. The next prime is 516561641. The reversal of 516561611 is 116165615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 516561611 - 2²² = 512367307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (516561641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16106 + ... + 35951.

It is an arithmetic number, because the mean of its divisors is an integer number (129155898).

Almost surely, 2^516561611 is an apocalyptic number.

516561611 is a deficient number, since it is larger than the sum of its proper divisors (61981).

516561611 is an equidigital number, since it uses as much as digits as its factorization.

516561611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61980.

The product of its digits is 5400, while the sum is 32.

The square root of 516561611 is about 22727.9917942611. The cubic root of 516561611 is about 802.3688180160.

The spelling of 516561611 in words is "five hundred sixteen million, five hundred sixty-one thousand, six hundred eleven".