221525752532645 has 12 divisors (see below), whose sum is σ = 292194298382700. Its totient is φ = 161109638205120.

The previous prime is 221525752532593. The next prime is 221525752532653. The reversal of 221525752532645 is 546235257525122.

It can be written as a sum of positive squares in 2 ways, for example, as 135745591282081 + 85780161250564 = 11650991^2 + 9261758^2 .

It is not a de Polignac number, because 221525752532645 - 2³⁸ = 221250874625701 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183079133720 + ... + 183079134929.

It is an arithmetic number, because the mean of its divisors is an integer number (24349524865225).

Almost surely, 2^{221525752532645} is an apocalyptic number.

It is an amenable number.

221525752532645 is a deficient number, since it is larger than the sum of its proper divisors (70668545850055).

221525752532645 is a wasteful number, since it uses less digits than its factorization.

221525752532645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366158268676 (or 366158268665 counting only the distinct ones).

The product of its digits is 50400000, while the sum is 56.

The spelling of 221525752532645 in words is "two hundred twenty-one trillion, five hundred twenty-five billion, seven hundred fifty-two million, five hundred thirty-two thousand, six hundred forty-five".