51616565665567 has 8 divisors (see below), whose sum is σ = 58990444115616. Its totient is φ = 44242708054272.

The previous prime is 51616565665547. The next prime is 51616565665583. The reversal of 51616565665567 is 76556656561615.

It is a happy number.

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

It is not a de Polignac number, because 51616565665567 - 2²³ = 51616557276959 is a prime.

It is a super-2 number, since 2×51616565665567² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51616565665496 and 51616565665505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51616565665507) 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, 517863 + ... + 10173559.

It is an arithmetic number, because the mean of its divisors is an integer number (7373805514452).

Almost surely, 2^{51616565665567} is an apocalyptic number.

51616565665567 is a deficient number, since it is larger than the sum of its proper divisors (7373878450049).

51616565665567 is an equidigital number, since it uses as much as digits as its factorization.

51616565665567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10419377.

The product of its digits is 1020600000, while the sum is 70.

The spelling of 51616565665567 in words is "fifty-one trillion, six hundred sixteen billion, five hundred sixty-five million, six hundred sixty-five thousand, five hundred sixty-seven".