521825004145 has 4 divisors (see below), whose sum is σ = 626190004980. Its totient is φ = 417460003312.

The previous prime is 521825004091. The next prime is 521825004149. The reversal of 521825004145 is 541400528125.

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 215183726641 + 306641277504 = 463879^2 + 553752^2 .

It is a cyclic number.

It is not a de Polignac number, because 521825004145 - 2⁷ = 521825004017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521825004149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52182500410 + ... + 52182500419.

It is an arithmetic number, because the mean of its divisors is an integer number (156547501245).

Almost surely, 2^521825004145 is an apocalyptic number.

It is an amenable number.

521825004145 is a deficient number, since it is larger than the sum of its proper divisors (104365000835).

521825004145 is a wasteful number, since it uses less digits than its factorization.

521825004145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104365000834.

The product of its (nonzero) digits is 64000, while the sum is 37.

The spelling of 521825004145 in words is "five hundred twenty-one billion, eight hundred twenty-five million, four thousand, one hundred forty-five".