85339024721 has 2 divisors, whose sum is σ = 85339024722. Its totient is φ = 85339024720.

The previous prime is 85339024709. The next prime is 85339024733. The reversal of 85339024721 is 12742093358.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (85339024709) and next prime (85339024733).

It can be written as a sum of positive squares in only one way, i.e., 42857280400 + 42481744321 = 207020^2 + 206111^2 .

It is a cyclic number.

It is not a de Polignac number, because 85339024721 - 2²² = 85334830417 is a prime.

It is not a weakly prime, because it can be changed into another prime (85339024741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42669512360 + 42669512361.

It is an arithmetic number, because the mean of its divisors is an integer number (42669512361).

Almost surely, 2^85339024721 is an apocalyptic number.

It is an amenable number.

85339024721 is a deficient number, since it is larger than the sum of its proper divisors (1).

85339024721 is an equidigital number, since it uses as much as digits as its factorization.

85339024721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 85339024721 in words is "eighty-five billion, three hundred thirty-nine million, twenty-four thousand, seven hundred twenty-one".