521055627661357 has 4 divisors (see below), whose sum is σ = 521056287023776. Its totient is φ = 521054968298940.

The previous prime is 521055627661301. The next prime is 521055627661559. The reversal of 521055627661357 is 753166726550125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 521055627661357 - 2¹⁹ = 521055627137069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521055627661295 and 521055627661304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521055627661157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328494423 + ... + 330076804.

It is an arithmetic number, because the mean of its divisors is an integer number (130264071755944).

Almost surely, 2^{521055627661357} is an apocalyptic number.

It is an amenable number.

521055627661357 is a deficient number, since it is larger than the sum of its proper divisors (659362419).

521055627661357 is an equidigital number, since it uses as much as digits as its factorization.

521055627661357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659362418.

The product of its (nonzero) digits is 79380000, while the sum is 61.

The spelling of 521055627661357 in words is "five hundred twenty-one trillion, fifty-five billion, six hundred twenty-seven million, six hundred sixty-one thousand, three hundred fifty-seven".