4155649909 has 2 divisors, whose sum is σ = 4155649910. Its totient is φ = 4155649908.

The previous prime is 4155649889. The next prime is 4155649921. The reversal of 4155649909 is 9099465514.

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., 2505503025 + 1650146884 = 50055^2 + 40622^2 .

It is a cyclic number.

It is not a de Polignac number, because 4155649909 - 2²⁵ = 4122095477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4155649969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2077824954 + 2077824955.

It is an arithmetic number, because the mean of its divisors is an integer number (2077824955).

Almost surely, 2^4155649909 is an apocalyptic number.

It is an amenable number.

4155649909 is a deficient number, since it is larger than the sum of its proper divisors (1).

4155649909 is an equidigital number, since it uses as much as digits as its factorization.

4155649909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1749600, while the sum is 52.

The square root of 4155649909 is about 64464.3305169611. The cubic root of 4155649909 is about 1607.7295142349.

The spelling of 4155649909 in words is "four billion, one hundred fifty-five million, six hundred forty-nine thousand, nine hundred nine".