425441720909 has 2 divisors, whose sum is σ = 425441720910. Its totient is φ = 425441720908.

The previous prime is 425441720839. The next prime is 425441720939. The reversal of 425441720909 is 909027144524.

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., 406897273225 + 18544447684 = 637885^2 + 136178^2 .

It is a cyclic number.

It is not a de Polignac number, because 425441720909 - 2²⁰ = 425440672333 is a prime.

It is a super-2 number, since 2×425441720909² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (425441720939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212720860454 + 212720860455.

It is an arithmetic number, because the mean of its divisors is an integer number (212720860455).

Almost surely, 2^425441720909 is an apocalyptic number.

It is an amenable number.

425441720909 is a deficient number, since it is larger than the sum of its proper divisors (1).

425441720909 is an equidigital number, since it uses as much as digits as its factorization.

425441720909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 425441720909 in words is "four hundred twenty-five billion, four hundred forty-one million, seven hundred twenty thousand, nine hundred nine".