521747873680747 has 48 divisors (see below), whose sum is σ = 616643888055552. Its totient is φ = 440101216537920.

The previous prime is 521747873680651. The next prime is 521747873680753. The reversal of 521747873680747 is 747086378747125.

It is a de Polignac number, because none of the positive numbers 2^k-521747873680747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521747873683747) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1071276828 + ... + 1071763750.

It is an arithmetic number, because the mean of its divisors is an integer number (12846747667824).

Almost surely, 2^{521747873680747} is an apocalyptic number.

521747873680747 is a deficient number, since it is larger than the sum of its proper divisors (94896014374805).

521747873680747 is a wasteful number, since it uses less digits than its factorization.

521747873680747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488048 (or 488041 counting only the distinct ones).

The product of its (nonzero) digits is 3097866240, while the sum is 76.

The spelling of 521747873680747 in words is "five hundred twenty-one trillion, seven hundred forty-seven billion, eight hundred seventy-three million, six hundred eighty thousand, seven hundred forty-seven".