616166566565 has 32 divisors (see below), whose sum is σ = 843035074560. Its totient is φ = 428208076800.

The previous prime is 616166566541. The next prime is 616166566597. The reversal of 616166566565 is 565665661616.

It is a happy number.

It is not a de Polignac number, because 616166566565 - 2¹⁸ = 616166304421 is a prime.

It is a super-2 number, since 2×616166566565² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1836581 + ... + 2146010.

It is an arithmetic number, because the mean of its divisors is an integer number (26344846080).

Almost surely, 2^616166566565 is an apocalyptic number.

It is an amenable number.

616166566565 is a deficient number, since it is larger than the sum of its proper divisors (226868507995).

616166566565 is a wasteful number, since it uses less digits than its factorization.

616166566565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3982733.

The product of its digits is 34992000, while the sum is 59.

The spelling of 616166566565 in words is "six hundred sixteen billion, one hundred sixty-six million, five hundred sixty-six thousand, five hundred sixty-five".