89168760721 has 2 divisors, whose sum is σ = 89168760722. Its totient is φ = 89168760720.

The previous prime is 89168760719. The next prime is 89168760731. The reversal of 89168760721 is 12706786198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48217572225 + 40951188496 = 219585^2 + 202364^2 .

It is a cyclic number.

It is not a de Polignac number, because 89168760721 - 2¹ = 89168760719 is a prime.

Together with 89168760719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (89168760731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44584380360 + 44584380361.

It is an arithmetic number, because the mean of its divisors is an integer number (44584380361).

Almost surely, 2^89168760721 is an apocalyptic number.

It is an amenable number.

89168760721 is a deficient number, since it is larger than the sum of its proper divisors (1).

89168760721 is an equidigital number, since it uses as much as digits as its factorization.

89168760721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 89168760721 in words is "eighty-nine billion, one hundred sixty-eight million, seven hundred sixty thousand, seven hundred twenty-one".