521506064170055 has 4 divisors (see below), whose sum is σ = 625807277004072. Its totient is φ = 417204851336040.

The previous prime is 521506064170031. The next prime is 521506064170099. The reversal of 521506064170055 is 550071460605125.

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

It is not a de Polignac number, because 521506064170055 - 2⁶ = 521506064169991 is a prime.

It is a super-2 number, since 2×521506064170055² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 521506064169991 and 521506064170009.

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, 52150606417001 + ... + 52150606417010.

It is an arithmetic number, because the mean of its divisors is an integer number (156451819251018).

Almost surely, 2^{521506064170055} is an apocalyptic number.

521506064170055 is a deficient number, since it is larger than the sum of its proper divisors (104301212834017).

521506064170055 is a wasteful number, since it uses less digits than its factorization.

521506064170055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104301212834016.

The product of its (nonzero) digits is 1260000, while the sum is 47.

The spelling of 521506064170055 in words is "five hundred twenty-one trillion, five hundred six billion, sixty-four million, one hundred seventy thousand, fifty-five".