505776779249 has 4 divisors (see below), whose sum is σ = 578030604864. Its totient is φ = 433522953636.

The previous prime is 505776779237. The next prime is 505776779257. The reversal of 505776779249 is 942977677505.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 505776779249 - 2⁸ = 505776778993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505776779219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36126912797 + ... + 36126912810.

It is an arithmetic number, because the mean of its divisors is an integer number (144507651216).

Almost surely, 2^505776779249 is an apocalyptic number.

It is an amenable number.

505776779249 is a deficient number, since it is larger than the sum of its proper divisors (72253825615).

505776779249 is an equidigital number, since it uses as much as digits as its factorization.

505776779249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72253825614.

The product of its (nonzero) digits is 233377200, while the sum is 68.

The spelling of 505776779249 in words is "five hundred five billion, seven hundred seventy-six million, seven hundred seventy-nine thousand, two hundred forty-nine".