616765889 has 2 divisors, whose sum is σ = 616765890. Its totient is φ = 616765888.

The previous prime is 616765847. The next prime is 616765909. The reversal of 616765889 is 988567616.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 535459600 + 81306289 = 23140^2 + 9017^2 .

It is a cyclic number.

It is not a de Polignac number, because 616765889 - 2¹⁶ = 616700353 is a prime.

It is not a weakly prime, because it can be changed into another prime (616765189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308382944 + 308382945.

It is an arithmetic number, because the mean of its divisors is an integer number (308382945).

Almost surely, 2^616765889 is an apocalyptic number.

It is an amenable number.

616765889 is a deficient number, since it is larger than the sum of its proper divisors (1).

616765889 is an equidigital number, since it uses as much as digits as its factorization.

616765889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The square root of 616765889 is about 24834.7717726578. The cubic root of 616765889 is about 851.2166609118.

The spelling of 616765889 in words is "six hundred sixteen million, seven hundred sixty-five thousand, eight hundred eighty-nine".