85447074457 has 2 divisors, whose sum is σ = 85447074458. Its totient is φ = 85447074456.

The previous prime is 85447074451. The next prime is 85447074487. The reversal of 85447074457 is 75447074458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46423442521 + 39023631936 = 215461^2 + 197544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85447074457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85447074398 and 85447074407.

It is not a weakly prime, because it can be changed into another prime (85447074451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42723537228 + 42723537229.

It is an arithmetic number, because the mean of its divisors is an integer number (42723537229).

Almost surely, 2^85447074457 is an apocalyptic number.

It is an amenable number.

85447074457 is a deficient number, since it is larger than the sum of its proper divisors (1).

85447074457 is an equidigital number, since it uses as much as digits as its factorization.

85447074457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17561600, while the sum is 55.

Subtracting from 85447074457 its reverse (75447074458), we obtain a palindrome (9999999999).

The spelling of 85447074457 in words is "eighty-five billion, four hundred forty-seven million, seventy-four thousand, four hundred fifty-seven".