616863857 has 2 divisors, whose sum is σ = 616863858. Its totient is φ = 616863856.

The previous prime is 616863839. The next prime is 616863859. The reversal of 616863857 is 758368616.

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., 382437136 + 234426721 = 19556^2 + 15311^2 .

It is a cyclic number.

It is not a de Polignac number, because 616863857 - 2²² = 612669553 is a prime.

Together with 616863859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (616863859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308431928 + 308431929.

It is an arithmetic number, because the mean of its divisors is an integer number (308431929).

Almost surely, 2^616863857 is an apocalyptic number.

It is an amenable number.

616863857 is a deficient number, since it is larger than the sum of its proper divisors (1).

616863857 is an equidigital number, since it uses as much as digits as its factorization.

616863857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 50.

The square root of 616863857 is about 24836.7440901580. The cubic root of 616863857 is about 851.2617280274.

The spelling of 616863857 in words is "six hundred sixteen million, eight hundred sixty-three thousand, eight hundred fifty-seven".