505544640247 has 4 divisors (see below), whose sum is σ = 505645895920. Its totient is φ = 505443384576.

The previous prime is 505544640199. The next prime is 505544640329. The reversal of 505544640247 is 742046445505.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 505544640247 - 2³⁵ = 471184901879 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505544640197 and 505544640206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505544640947) 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, 50620347 + ... + 50630332.

It is an arithmetic number, because the mean of its divisors is an integer number (126411473980).

Almost surely, 2^505544640247 is an apocalyptic number.

505544640247 is a deficient number, since it is larger than the sum of its proper divisors (101255673).

505544640247 is a wasteful number, since it uses less digits than its factorization.

505544640247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101255672.

The product of its (nonzero) digits is 2688000, while the sum is 46.

The spelling of 505544640247 in words is "five hundred five billion, five hundred forty-four million, six hundred forty thousand, two hundred forty-seven".