255620416409 has 2 divisors, whose sum is σ = 255620416410. Its totient is φ = 255620416408.

The previous prime is 255620416397. The next prime is 255620416417. The reversal of 255620416409 is 904614026552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250372138384 + 5248278025 = 500372^2 + 72445^2 .

It is a cyclic number.

It is not a de Polignac number, because 255620416409 - 2⁸ = 255620416153 is a prime.

It is a super-2 number, since 2×255620416409² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 255620416409.

It is not a weakly prime, because it can be changed into another prime (255620416439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127810208204 + 127810208205.

It is an arithmetic number, because the mean of its divisors is an integer number (127810208205).

Almost surely, 2^255620416409 is an apocalyptic number.

It is an amenable number.

255620416409 is a deficient number, since it is larger than the sum of its proper divisors (1).

255620416409 is an equidigital number, since it uses as much as digits as its factorization.

255620416409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 255620416409 in words is "two hundred fifty-five billion, six hundred twenty million, four hundred sixteen thousand, four hundred nine".