6155857649 has 2 divisors, whose sum is σ = 6155857650. Its totient is φ = 6155857648.

The previous prime is 6155857583. The next prime is 6155857651. The reversal of 6155857649 is 9467585516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5102530624 + 1053327025 = 71432^2 + 32455^2 .

It is a cyclic number.

It is not a de Polignac number, because 6155857649 - 2²⁸ = 5887422193 is a prime.

Together with 6155857651, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6155857594 and 6155857603.

It is not a weakly prime, because it can be changed into another prime (6155857679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3077928824 + 3077928825.

It is an arithmetic number, because the mean of its divisors is an integer number (3077928825).

Almost surely, 2^6155857649 is an apocalyptic number.

It is an amenable number.

6155857649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6155857649 is an equidigital number, since it uses as much as digits as its factorization.

6155857649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072000, while the sum is 56.

The square root of 6155857649 is about 78459.2738240675. The cubic root of 6155857649 is about 1832.7202964952.

The spelling of 6155857649 in words is "six billion, one hundred fifty-five million, eight hundred fifty-seven thousand, six hundred forty-nine".