85669553 has 2 divisors, whose sum is σ = 85669554. Its totient is φ = 85669552.

The previous prime is 85669517. The next prime is 85669583. The reversal of 85669553 is 35596658.

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., 81577024 + 4092529 = 9032^2 + 2023^2 .

It is a cyclic number.

It is not a de Polignac number, because 85669553 - 2¹² = 85665457 is a prime.

It is a super-2 number, since 2×85669553² = 14678544622439618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85669498 and 85669507.

It is not a weakly prime, because it can be changed into another prime (85669583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42834776 + 42834777.

It is an arithmetic number, because the mean of its divisors is an integer number (42834777).

Almost surely, 2^85669553 is an apocalyptic number.

It is an amenable number.

85669553 is a deficient number, since it is larger than the sum of its proper divisors (1).

85669553 is an equidigital number, since it uses as much as digits as its factorization.

85669553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 47.

The square root of 85669553 is about 9255.7848397637. The cubic root of 85669553 is about 440.8344238150.

It can be divided in two parts, 8566955 and 3, that multiplied together give a triangular number (25700865 = T₇₁₆₉).

The spelling of 85669553 in words is "eighty-five million, six hundred sixty-nine thousand, five hundred fifty-three".