4263945649 has 2 divisors, whose sum is σ = 4263945650. Its totient is φ = 4263945648.

The previous prime is 4263945571. The next prime is 4263945659. The reversal of 4263945649 is 9465493624.

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., 3178704400 + 1085241249 = 56380^2 + 32943^2 .

It is a cyclic number.

It is not a de Polignac number, because 4263945649 - 2¹¹ = 4263943601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4263945596 and 4263945605.

It is not a weakly prime, because it can be changed into another prime (4263945659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2131972824 + 2131972825.

It is an arithmetic number, because the mean of its divisors is an integer number (2131972825).

Almost surely, 2^4263945649 is an apocalyptic number.

It is an amenable number.

4263945649 is a deficient number, since it is larger than the sum of its proper divisors (1).

4263945649 is an equidigital number, since it uses as much as digits as its factorization.

4263945649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 52.

The square root of 4263945649 is about 65298.8946996808. The cubic root of 4263945649 is about 1621.5756717681.

It can be divided in two parts, 42639 and 45649, that added together give a palindrome (88288).

The spelling of 4263945649 in words is "four billion, two hundred sixty-three million, nine hundred forty-five thousand, six hundred forty-nine".