85293618721 has 2 divisors, whose sum is σ = 85293618722. Its totient is φ = 85293618720.

The previous prime is 85293618671. The next prime is 85293618731. The reversal of 85293618721 is 12781639258.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53714551696 + 31579067025 = 231764^2 + 177705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85293618721 is a prime.

It is not a weakly prime, because it can be changed into another prime (85293618731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42646809360 + 42646809361.

It is an arithmetic number, because the mean of its divisors is an integer number (42646809361).

Almost surely, 2^85293618721 is an apocalyptic number.

It is an amenable number.

85293618721 is a deficient number, since it is larger than the sum of its proper divisors (1).

85293618721 is an equidigital number, since it uses as much as digits as its factorization.

85293618721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 52.

The spelling of 85293618721 in words is "eighty-five billion, two hundred ninety-three million, six hundred eighteen thousand, seven hundred twenty-one".