516215165561 has 8 divisors (see below), whose sum is σ = 522975627264. Its totient is φ = 509496825600.

The previous prime is 516215165537. The next prime is 516215165569. The reversal of 516215165561 is 165561512615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-516215165561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (516215165569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10505765 + ... + 10554786.

It is an arithmetic number, because the mean of its divisors is an integer number (65371953408).

Almost surely, 2^516215165561 is an apocalyptic number.

It is an amenable number.

516215165561 is a deficient number, since it is larger than the sum of its proper divisors (6760461703).

516215165561 is a wasteful number, since it uses less digits than its factorization.

516215165561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21060871.

The product of its digits is 270000, while the sum is 44.

The spelling of 516215165561 in words is "five hundred sixteen billion, two hundred fifteen million, one hundred sixty-five thousand, five hundred sixty-one".