11641525645221 has 6 divisors (see below), whose sum is σ = 16815537043110. Its totient is φ = 7761017096808.

The previous prime is 11641525645207. The next prime is 11641525645241. The reversal of 11641525645221 is 12254652514611.

11641525645221 is a `hidden beast` number, since 1 + 1 + 6 + 4 + 15 + 2 + 564 + 52 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9545096756196 + 2096428889025 = 3089514^2 + 1447905^2 .

It is not a de Polignac number, because 11641525645221 - 2¹³ = 11641525637029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11641525645241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 646751424726 + ... + 646751424743.

It is an arithmetic number, because the mean of its divisors is an integer number (2802589507185).

Almost surely, 2^{11641525645221} is an apocalyptic number.

It is an amenable number.

11641525645221 is a deficient number, since it is larger than the sum of its proper divisors (5174011397889).

11641525645221 is a wasteful number, since it uses less digits than its factorization.

11641525645221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293502849475 (or 1293502849472 counting only the distinct ones).

The product of its digits is 576000, while the sum is 45.

The spelling of 11641525645221 in words is "eleven trillion, six hundred forty-one billion, five hundred twenty-five million, six hundred forty-five thousand, two hundred twenty-one".