505765542721 has 8 divisors (see below), whose sum is σ = 507272729600. Its totient is φ = 504259676640.

The previous prime is 505765542701. The next prime is 505765542739. The reversal of 505765542721 is 127245567505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 505765542721 - 2¹³ = 505765534529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505765542701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439456 + ... + 1097566.

It is an arithmetic number, because the mean of its divisors is an integer number (63409091200).

Almost surely, 2^505765542721 is an apocalyptic number.

It is an amenable number.

505765542721 is a deficient number, since it is larger than the sum of its proper divisors (1507186879).

505765542721 is a wasteful number, since it uses less digits than its factorization.

505765542721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660399.

The product of its (nonzero) digits is 2940000, while the sum is 49.

The spelling of 505765542721 in words is "five hundred five billion, seven hundred sixty-five million, five hundred forty-two thousand, seven hundred twenty-one".