521315435064 has 64 divisors (see below), whose sum is σ = 1310751820800. Its totient is φ = 172778772096.

The previous prime is 521315435057. The next prime is 521315435087. The reversal of 521315435064 is 460534513125.

It is a happy number.

It is a super-3 number, since 3×521315435064³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4019697 + ... + 4147359.

It is an arithmetic number, because the mean of its divisors is an integer number (20480497200).

Almost surely, 2^521315435064 is an apocalyptic number.

It is an amenable number.

521315435064 is an abundant number, since it is smaller than the sum of its proper divisors (789436385736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521315435064 is a wasteful number, since it uses less digits than its factorization.

521315435064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128644 (or 128640 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

Adding to 521315435064 its reverse (460534513125), we get a palindrome (981849948189).

The spelling of 521315435064 in words is "five hundred twenty-one billion, three hundred fifteen million, four hundred thirty-five thousand, sixty-four".