505455723779 has 2 divisors, whose sum is σ = 505455723780. Its totient is φ = 505455723778.

The previous prime is 505455723769. The next prime is 505455723781. The reversal of 505455723779 is 977327554505.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 505455723779 - 2²⁰ = 505454675203 is a prime.

Together with 505455723781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505455723769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252727861889 + 252727861890.

It is an arithmetic number, because the mean of its divisors is an integer number (252727861890).

Almost surely, 2^505455723779 is an apocalyptic number.

505455723779 is a deficient number, since it is larger than the sum of its proper divisors (1).

505455723779 is an equidigital number, since it uses as much as digits as its factorization.

505455723779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46305000, while the sum is 59.

The spelling of 505455723779 in words is "five hundred five billion, four hundred fifty-five million, seven hundred twenty-three thousand, seven hundred seventy-nine".