521334140465 has 16 divisors (see below), whose sum is σ = 670785857280. Its totient is φ = 387565152000.

The previous prime is 521334140423. The next prime is 521334140489. The reversal of 521334140465 is 564041433125.

It is not a de Polignac number, because 521334140465 - 2¹⁶ = 521334074929 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38811911 + ... + 38825340.

It is an arithmetic number, because the mean of its divisors is an integer number (41924116080).

Almost surely, 2^521334140465 is an apocalyptic number.

It is an amenable number.

521334140465 is a deficient number, since it is larger than the sum of its proper divisors (149451716815).

521334140465 is a wasteful number, since it uses less digits than its factorization.

521334140465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77637352.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 521334140465 in words is "five hundred twenty-one billion, three hundred thirty-four million, one hundred forty thousand, four hundred sixty-five".