521513540065 has 16 divisors (see below), whose sum is σ = 715514596992. Its totient is φ = 357461270784.

The previous prime is 521513540063. The next prime is 521513540069. The reversal of 521513540065 is 560045315125.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 521513540065 - 2¹ = 521513540063 is a prime.

It is a super-2 number, since 2×521513540065² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521513540063) 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 15 ways as a sum of consecutive naturals, for example, 2997819 + ... + 3167008.

It is an arithmetic number, because the mean of its divisors is an integer number (44719662312).

Almost surely, 2^521513540065 is an apocalyptic number.

It is an amenable number.

521513540065 is a deficient number, since it is larger than the sum of its proper divisors (194001056927).

521513540065 is a wasteful number, since it uses less digits than its factorization.

521513540065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6167256.

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 521513540065 in words is "five hundred twenty-one billion, five hundred thirteen million, five hundred forty thousand, sixty-five".