505780779591 has 12 divisors (see below), whose sum is σ = 737805627000. Its totient is φ = 333848698800.

The previous prime is 505780779541. The next prime is 505780779599. The reversal of 505780779591 is 195977087505.

505780779591 is a `hidden beast` number, since 5 + 0 + 578 + 0 + 7 + 7 + 9 + 59 + 1 = 666.

505780779591 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 505780779591 - 2¹⁴ = 505780763207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505780779599) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 278206341 + ... + 278208158.

It is an arithmetic number, because the mean of its divisors is an integer number (61483802250).

Almost surely, 2^505780779591 is an apocalyptic number.

505780779591 is a deficient number, since it is larger than the sum of its proper divisors (232024847409).

505780779591 is a wasteful number, since it uses less digits than its factorization.

505780779591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556414606 (or 556414603 counting only the distinct ones).

The product of its (nonzero) digits is 27783000, while the sum is 63.

The spelling of 505780779591 in words is "five hundred five billion, seven hundred eighty million, seven hundred seventy-nine thousand, five hundred ninety-one".