616561126779 has 24 divisors (see below), whose sum is σ = 891265163520. Its totient is φ = 378960952032.

The previous prime is 616561126613. The next prime is 616561126781. The reversal of 616561126779 is 977621165616.

It is not a de Polignac number, because 616561126779 - 2²¹ = 616559029627 is a prime.

It is a super-2 number, since 2×616561126779² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (616561126579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 321559 + ... + 1156080.

It is an arithmetic number, because the mean of its divisors is an integer number (37136048480).

Almost surely, 2^616561126779 is an apocalyptic number.

616561126779 is a deficient number, since it is larger than the sum of its proper divisors (274704036741).

616561126779 is a wasteful number, since it uses less digits than its factorization.

616561126779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478491 (or 1478478 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 57.

The spelling of 616561126779 in words is "six hundred sixteen billion, five hundred sixty-one million, one hundred twenty-six thousand, seven hundred seventy-nine".