520637731445 has 24 divisors (see below), whose sum is σ = 682434441528. Its totient is φ = 379055617920.

The previous prime is 520637731433. The next prime is 520637731451. The reversal of 520637731445 is 544137736025.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 48381521764 + 472256209681 = 219958^2 + 687209^2 .

It is not a de Polignac number, because 520637731445 - 2¹⁴ = 520637715061 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520637731445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 466802 + ... + 1122131.

It is an arithmetic number, because the mean of its divisors is an integer number (28434768397).

Almost surely, 2^520637731445 is an apocalyptic number.

It is an amenable number.

520637731445 is a deficient number, since it is larger than the sum of its proper divisors (161796710083).

520637731445 is a wasteful number, since it uses less digits than its factorization.

520637731445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589093 (or 1589022 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 47.

The spelling of 520637731445 in words is "five hundred twenty billion, six hundred thirty-seven million, seven hundred thirty-one thousand, four hundred forty-five".