85223620208897 has 4 divisors (see below), whose sum is σ = 85226568233940. Its totient is φ = 85220672183856.

The previous prime is 85223620208851. The next prime is 85223620208927. The reversal of 85223620208897 is 79880202632258.

It is a Cunningham number, because it is equal to 9231664²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85117526039056 + 106094169841 = 9225916^2 + 325721^2 .

It is a cyclic number.

It is not a de Polignac number, because 85223620208897 - 2³⁸ = 84948742301953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85223620208497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1473969158 + ... + 1474026975.

It is an arithmetic number, because the mean of its divisors is an integer number (21306642058485).

Almost surely, 2^{85223620208897} is an apocalyptic number.

It is an amenable number.

85223620208897 is a deficient number, since it is larger than the sum of its proper divisors (2948025043).

85223620208897 is a wasteful number, since it uses less digits than its factorization.

85223620208897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2948025042.

The product of its (nonzero) digits is 46448640, while the sum is 62.

The spelling of 85223620208897 in words is "eighty-five trillion, two hundred twenty-three billion, six hundred twenty million, two hundred eight thousand, eight hundred ninety-seven".