88661262720221 has 2 divisors, whose sum is σ = 88661262720222. Its totient is φ = 88661262720220.

The previous prime is 88661262720209. The next prime is 88661262720269. The reversal of 88661262720221 is 12202726216688.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87715868205625 + 945394514596 = 9365675^2 + 972314^2 .

It is a cyclic number.

It is not a de Polignac number, because 88661262720221 - 2³⁰ = 88660188978397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88661262770221) 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 as a sum of consecutive naturals, namely, 44330631360110 + 44330631360111.

It is an arithmetic number, because the mean of its divisors is an integer number (44330631360111).

Almost surely, 2^{88661262720221} is an apocalyptic number.

It is an amenable number.

88661262720221 is a deficient number, since it is larger than the sum of its proper divisors (1).

88661262720221 is an equidigital number, since it uses as much as digits as its factorization.

88661262720221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3096576, while the sum is 53.

The spelling of 88661262720221 in words is "eighty-eight trillion, six hundred sixty-one billion, two hundred sixty-two million, seven hundred twenty thousand, two hundred twenty-one".