53516531561 has 8 divisors (see below), whose sum is σ = 53898583200. Its totient is φ = 53135691840.

The previous prime is 53516531533. The next prime is 53516531609. The reversal of 53516531561 is 16513561535.

It is a happy number.

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-53516531561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53516531501) 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, 214256 + ... + 391073.

It is an arithmetic number, because the mean of its divisors is an integer number (6737322900).

Almost surely, 2^53516531561 is an apocalyptic number.

It is an amenable number.

53516531561 is a deficient number, since it is larger than the sum of its proper divisors (382051639).

53516531561 is a wasteful number, since it uses less digits than its factorization.

53516531561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605959.

The product of its digits is 202500, while the sum is 41.

The spelling of 53516531561 in words is "fifty-three billion, five hundred sixteen million, five hundred thirty-one thousand, five hundred sixty-one".