4128135322581 has 12 divisors (see below), whose sum is σ = 5963194429452. Its totient is φ = 2751936847296.

The previous prime is 4128135322541. The next prime is 4128135322583. The reversal of 4128135322581 is 1852235318214.

4128135322581 is a `hidden beast` number, since 4 + 1 + 2 + 8 + 1 + 35 + 32 + 2 + 581 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3342370086225 + 785765236356 = 1828215^2 + 886434^2 .

It is not a de Polignac number, because 4128135322581 - 2¹⁸ = 4128135060437 is a prime.

It is a super-2 number, since 2×4128135322581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4128135322583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12610056 + ... + 12933281.

It is an arithmetic number, because the mean of its divisors is an integer number (496932869121).

Almost surely, 2^{4128135322581} is an apocalyptic number.

It is an amenable number.

4128135322581 is a deficient number, since it is larger than the sum of its proper divisors (1835059106871).

4128135322581 is a wasteful number, since it uses less digits than its factorization.

4128135322581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25561300 (or 25561297 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The spelling of 4128135322581 in words is "four trillion, one hundred twenty-eight billion, one hundred thirty-five million, three hundred twenty-two thousand, five hundred eighty-one".