505858399785 has 12 divisors (see below), whose sum is σ = 876821226372. Its totient is φ = 269791146528.

The previous prime is 505858399771. The next prime is 505858399793. The reversal of 505858399785 is 587993858505.

505858399785 is a `hidden beast` number, since 5 + 0 + 585 + 8 + 39 + 9 + 7 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 70638476841 + 435219922944 = 265779^2 + 659712^2 .

It is not a de Polignac number, because 505858399785 - 2⁶ = 505858399721 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5620648842 + ... + 5620648931.

It is an arithmetic number, because the mean of its divisors is an integer number (73068435531).

Almost surely, 2^505858399785 is an apocalyptic number.

It is an amenable number.

505858399785 is a deficient number, since it is larger than the sum of its proper divisors (370962826587).

505858399785 is a wasteful number, since it uses less digits than its factorization.

505858399785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11241297784 (or 11241297781 counting only the distinct ones).

The product of its (nonzero) digits is 544320000, while the sum is 72.

The spelling of 505858399785 in words is "five hundred five billion, eight hundred fifty-eight million, three hundred ninety-nine thousand, seven hundred eighty-five".