521855055445 has 4 divisors (see below), whose sum is σ = 626226066540. Its totient is φ = 417484044352.

The previous prime is 521855055439. The next prime is 521855055499. The reversal of 521855055445 is 544550558125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144653951556 + 377201103889 = 380334^2 + 614167^2 .

It is a cyclic number.

It is not a de Polignac number, because 521855055445 - 2¹³ = 521855047253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52185505540 + ... + 52185505549.

It is an arithmetic number, because the mean of its divisors is an integer number (156556516635).

Almost surely, 2^521855055445 is an apocalyptic number.

It is an amenable number.

521855055445 is a deficient number, since it is larger than the sum of its proper divisors (104371011095).

521855055445 is a wasteful number, since it uses less digits than its factorization.

521855055445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104371011094.

The product of its (nonzero) digits is 4000000, while the sum is 49.

The spelling of 521855055445 in words is "five hundred twenty-one billion, eight hundred fifty-five million, fifty-five thousand, four hundred forty-five".