513563656261 has 16 divisors (see below), whose sum is σ = 543689530560. Its totient is φ = 483750610560.

The previous prime is 513563656253. The next prime is 513563656349. The reversal of 513563656261 is 162656365315.

It is a cyclic number.

It is not a de Polignac number, because 513563656261 - 2³ = 513563656253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513563656201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5836585 + ... + 5923921.

It is an arithmetic number, because the mean of its divisors is an integer number (33980595660).

Almost surely, 2^513563656261 is an apocalyptic number.

It is an amenable number.

513563656261 is a deficient number, since it is larger than the sum of its proper divisors (30125874299).

513563656261 is a wasteful number, since it uses less digits than its factorization.

513563656261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89124.

The product of its digits is 2916000, while the sum is 49.

The spelling of 513563656261 in words is "five hundred thirteen billion, five hundred sixty-three million, six hundred fifty-six thousand, two hundred sixty-one".