85438544583449 has 2 divisors, whose sum is σ = 85438544583450. Its totient is φ = 85438544583448.

The previous prime is 85438544583409. The next prime is 85438544583463. The reversal of 85438544583449 is 94438544583458.

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., 72502977057424 + 12935567526025 = 8514868^2 + 3596605^2 .

It is a cyclic number.

It is not a de Polignac number, because 85438544583449 - 2³² = 85434249616153 is a prime.

It is not a weakly prime, because it can be changed into another prime (85438544583409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42719272291724 + 42719272291725.

It is an arithmetic number, because the mean of its divisors is an integer number (42719272291725).

Almost surely, 2^{85438544583449} is an apocalyptic number.

It is an amenable number.

85438544583449 is a deficient number, since it is larger than the sum of its proper divisors (1).

85438544583449 is an equidigital number, since it uses as much as digits as its factorization.

85438544583449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5308416000, while the sum is 74.

Subtracting 85438544583449 from its reverse (94438544583458), we obtain a palindrome (9000000000009).

The spelling of 85438544583449 in words is "eighty-five trillion, four hundred thirty-eight billion, five hundred forty-four million, five hundred eighty-three thousand, four hundred forty-nine".