505045913691 has 24 divisors (see below), whose sum is σ = 747506026512. Its totient is φ = 303057832000.

The previous prime is 505045913653. The next prime is 505045913711. The reversal of 505045913691 is 196319540505.

It is not a de Polignac number, because 505045913691 - 2¹³ = 505045905499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505045913691.

It is not an unprimeable number, because it can be changed into a prime (505045983691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6851016 + ... + 6924341.

It is an arithmetic number, because the mean of its divisors is an integer number (31146084438).

Almost surely, 2^505045913691 is an apocalyptic number.

505045913691 is a deficient number, since it is larger than the sum of its proper divisors (242460112821).

505045913691 is a wasteful number, since it uses less digits than its factorization.

505045913691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13775483 (or 13775472 counting only the distinct ones).

The product of its (nonzero) digits is 729000, while the sum is 48.

The spelling of 505045913691 in words is "five hundred five billion, forty-five million, nine hundred thirteen thousand, six hundred ninety-one".