8885725721 has 2 divisors, whose sum is σ = 8885725722. Its totient is φ = 8885725720.

The previous prime is 8885725661. The next prime is 8885725747. The reversal of 8885725721 is 1275275888.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8885701696 + 24025 = 94264^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 8885725721 - 2¹⁰ = 8885724697 is a prime.

It is a super-2 number, since 2×8885725721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8885725781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4442862860 + 4442862861.

It is an arithmetic number, because the mean of its divisors is an integer number (4442862861).

Almost surely, 2^8885725721 is an apocalyptic number.

It is an amenable number.

8885725721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8885725721 is an equidigital number, since it uses as much as digits as its factorization.

8885725721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2508800, while the sum is 53.

The square root of 8885725721 is about 94264.1274345655. The cubic root of 8885725721 is about 2071.2425906979.

The spelling of 8885725721 in words is "eight billion, eight hundred eighty-five million, seven hundred twenty-five thousand, seven hundred twenty-one".