85458826721 has 2 divisors, whose sum is σ = 85458826722. Its totient is φ = 85458826720.

The previous prime is 85458826637. The next prime is 85458826763. The reversal of 85458826721 is 12762885458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79512720400 + 5946106321 = 281980^2 + 77111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85458826721 is a prime.

It is a super-2 number, since 2×85458826721² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85458826421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42729413360 + 42729413361.

It is an arithmetic number, because the mean of its divisors is an integer number (42729413361).

Almost surely, 2^85458826721 is an apocalyptic number.

It is an amenable number.

85458826721 is a deficient number, since it is larger than the sum of its proper divisors (1).

85458826721 is an equidigital number, since it uses as much as digits as its factorization.

85458826721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8601600, while the sum is 56.

The spelling of 85458826721 in words is "eighty-five billion, four hundred fifty-eight million, eight hundred twenty-six thousand, seven hundred twenty-one".