85220552735917 has 2 divisors, whose sum is σ = 85220552735918. Its totient is φ = 85220552735916.

The previous prime is 85220552735897. The next prime is 85220552736019. The reversal of 85220552735917 is 71953725502258.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76400430858756 + 8820121877161 = 8740734^2 + 2969869^2 .

It is a cyclic number.

It is not a de Polignac number, because 85220552735917 - 2¹⁹ = 85220552211629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85220552730917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42610276367958 + 42610276367959.

It is an arithmetic number, because the mean of its divisors is an integer number (42610276367959).

Almost surely, 2^{85220552735917} is an apocalyptic number.

It is an amenable number.

85220552735917 is a deficient number, since it is larger than the sum of its proper divisors (1).

85220552735917 is an equidigital number, since it uses as much as digits as its factorization.

85220552735917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920000, while the sum is 61.

The spelling of 85220552735917 in words is "eighty-five trillion, two hundred twenty billion, five hundred fifty-two million, seven hundred thirty-five thousand, nine hundred seventeen".