505404343354403 has 2 divisors, whose sum is σ = 505404343354404. Its totient is φ = 505404343354402.

The previous prime is 505404343354357. The next prime is 505404343354459. The reversal of 505404343354403 is 304453343404505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505404343354403 - 2³⁸ = 505129465447459 is a prime.

It is a super-4 number, since 4×505404343354403⁴ (a number of 60 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (505404343354903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252702171677201 + 252702171677202.

It is an arithmetic number, because the mean of its divisors is an integer number (252702171677202).

Almost surely, 2^{505404343354403} is an apocalyptic number.

505404343354403 is a deficient number, since it is larger than the sum of its proper divisors (1).

505404343354403 is an equidigital number, since it uses as much as digits as its factorization.

505404343354403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368000, while the sum is 47.

Adding to 505404343354403 its reverse (304453343404505), we get a palindrome (809857686758908).

The spelling of 505404343354403 in words is "five hundred five trillion, four hundred four billion, three hundred forty-three million, three hundred fifty-four thousand, four hundred three".