51615000065561 has 8 divisors (see below), whose sum is σ = 54335850285600. Its totient is φ = 48894576972480.

The previous prime is 51615000065507. The next prime is 51615000065617. The reversal of 51615000065561 is 16556000051615.

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-51615000065561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51615000005561) 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, 106533671 + ... + 107017068.

It is an arithmetic number, because the mean of its divisors is an integer number (6791981285700).

Almost surely, 2^{51615000065561} is an apocalyptic number.

It is an amenable number.

51615000065561 is a deficient number, since it is larger than the sum of its proper divisors (2720850220039).

51615000065561 is a wasteful number, since it uses less digits than its factorization.

51615000065561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213563479.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 51615000065561 in words is "fifty-one trillion, six hundred fifteen billion, sixty-five thousand, five hundred sixty-one".