521725012136505 has 48 divisors (see below), whose sum is σ = 957717796847760. Its totient is φ = 261831082328064.

The previous prime is 521725012136443. The next prime is 521725012136557. The reversal of 521725012136505 is 505631210527125.

521725012136505 is a `hidden beast` number, since 5 + 2 + 1 + 7 + 2 + 5 + 0 + 1 + 2 + 136 + 505 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 154188147231504 + 367536864905001 = 12417252^2 + 19171251^2 .

It is not a de Polignac number, because 521725012136505 - 2⁸ = 521725012136249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67167160 + ... + 74531049.

It is an arithmetic number, because the mean of its divisors is an integer number (19952454100995).

Almost surely, 2^{521725012136505} is an apocalyptic number.

It is an amenable number.

521725012136505 is a deficient number, since it is larger than the sum of its proper divisors (435992784711255).

521725012136505 is a wasteful number, since it uses less digits than its factorization.

521725012136505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141703050 (or 141703047 counting only the distinct ones).

The product of its (nonzero) digits is 630000, while the sum is 45.

The spelling of 521725012136505 in words is "five hundred twenty-one trillion, seven hundred twenty-five billion, twelve million, one hundred thirty-six thousand, five hundred five".