85625221069 has 2 divisors, whose sum is σ = 85625221070. Its totient is φ = 85625221068.

The previous prime is 85625221063. The next prime is 85625221091. The reversal of 85625221069 is 96012252658.

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., 73078308900 + 12546912169 = 270330^2 + 112013^2 .

It is a cyclic number.

It is not a de Polignac number, because 85625221069 - 2¹⁵ = 85625188301 is a prime.

It is a super-2 number, since 2×85625221069² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85625221063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42812610534 + 42812610535.

It is an arithmetic number, because the mean of its divisors is an integer number (42812610535).

Almost surely, 2^85625221069 is an apocalyptic number.

It is an amenable number.

85625221069 is a deficient number, since it is larger than the sum of its proper divisors (1).

85625221069 is an equidigital number, since it uses as much as digits as its factorization.

85625221069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 46.

It can be divided in two parts, 8562522 and 1069, that added together give a triangular number (8563591 = T₄₁₃₈).

The spelling of 85625221069 in words is "eighty-five billion, six hundred twenty-five million, two hundred twenty-one thousand, sixty-nine".