505505557951 has 2 divisors, whose sum is σ = 505505557952. Its totient is φ = 505505557950.

The previous prime is 505505557919. The next prime is 505505558009. The reversal of 505505557951 is 159755505505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505505557951 - 2⁵ = 505505557919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505505554951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252752778975 + 252752778976.

It is an arithmetic number, because the mean of its divisors is an integer number (252752778976).

Almost surely, 2^505505557951 is an apocalyptic number.

505505557951 is a deficient number, since it is larger than the sum of its proper divisors (1).

505505557951 is an equidigital number, since it uses as much as digits as its factorization.

505505557951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4921875, while the sum is 52.

The spelling of 505505557951 in words is "five hundred five billion, five hundred five million, five hundred fifty-seven thousand, nine hundred fifty-one".