507780217909 has 2 divisors, whose sum is σ = 507780217910. Its totient is φ = 507780217908.

The previous prime is 507780217849. The next prime is 507780217921. The reversal of 507780217909 is 909712087705.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412022772100 + 95757445809 = 641890^2 + 309447^2 .

It is a cyclic number.

It is not a de Polignac number, because 507780217909 - 2¹⁷ = 507780086837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 507780217909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (507786217909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253890108954 + 253890108955.

It is an arithmetic number, because the mean of its divisors is an integer number (253890108955).

Almost surely, 2^507780217909 is an apocalyptic number.

It is an amenable number.

507780217909 is a deficient number, since it is larger than the sum of its proper divisors (1).

507780217909 is an equidigital number, since it uses as much as digits as its factorization.

507780217909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2222640, while the sum is 55.

The spelling of 507780217909 in words is "five hundred seven billion, seven hundred eighty million, two hundred seventeen thousand, nine hundred nine".