616352557421 has 2 divisors, whose sum is σ = 616352557422. Its totient is φ = 616352557420.

The previous prime is 616352557357. The next prime is 616352557423. The reversal of 616352557421 is 124755253616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616020916900 + 331640521 = 784870^2 + 18211^2 .

It is a cyclic number.

It is not a de Polignac number, because 616352557421 - 2⁶ = 616352557357 is a prime.

Together with 616352557423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616352557423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308176278710 + 308176278711.

It is an arithmetic number, because the mean of its divisors is an integer number (308176278711).

Almost surely, 2^616352557421 is an apocalyptic number.

It is an amenable number.

616352557421 is a deficient number, since it is larger than the sum of its proper divisors (1).

616352557421 is an equidigital number, since it uses as much as digits as its factorization.

616352557421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512000, while the sum is 47.

The spelling of 616352557421 in words is "six hundred sixteen billion, three hundred fifty-two million, five hundred fifty-seven thousand, four hundred twenty-one".