521052563440 has 40 divisors (see below), whose sum is σ = 1264118832288. Its totient is φ = 199359240960.

The previous prime is 521052563431. The next prime is 521052563443. The reversal of 521052563440 is 44365250125.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 521052563440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521052563443) 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, 141588531 + ... + 141592210.

Almost surely, 2^521052563440 is an apocalyptic number.

It is an amenable number.

521052563440 is an abundant number, since it is smaller than the sum of its proper divisors (743066268848).

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

521052563440 is a wasteful number, since it uses less digits than its factorization.

521052563440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283180777 (or 283180771 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 521052563440 in words is "five hundred twenty-one billion, fifty-two million, five hundred sixty-three thousand, four hundred forty".