616264776052621 has 2 divisors, whose sum is σ = 616264776052622. Its totient is φ = 616264776052620.

The previous prime is 616264776052619. The next prime is 616264776052637. The reversal of 616264776052621 is 126250677462616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 536046869014596 + 80217907038025 = 23152686^2 + 8956445^2 .

It is a cyclic number.

It is not a de Polignac number, because 616264776052621 - 2¹ = 616264776052619 is a prime.

It is a super-2 number, since 2×616264776052621² (a number of 30 digits) contains 22 as substring.

Together with 616264776052619, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 616264776052621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616264776002621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308132388026310 + 308132388026311.

It is an arithmetic number, because the mean of its divisors is an integer number (308132388026311).

Almost surely, 2^{616264776052621} is an apocalyptic number.

It is an amenable number.

616264776052621 is a deficient number, since it is larger than the sum of its proper divisors (1).

616264776052621 is an equidigital number, since it uses as much as digits as its factorization.

616264776052621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60963840, while the sum is 61.

The spelling of 616264776052621 in words is "six hundred sixteen trillion, two hundred sixty-four billion, seven hundred seventy-six million, fifty-two thousand, six hundred twenty-one".