85661258 has 4 divisors (see below), whose sum is σ = 128491890. Its totient is φ = 42830628.

The previous prime is 85661209. The next prime is 85661299. The reversal of 85661258 is 85216658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85216658 = 2 ⋅42608329.

It can be written as a sum of positive squares in only one way, i.e., 85063729 + 597529 = 9223^2 + 773^2 .

It is a super-2 number, since 2×85661258² = 14675702244285128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21415313 + ... + 21415316.

Almost surely, 2^85661258 is an apocalyptic number.

85661258 is a deficient number, since it is larger than the sum of its proper divisors (42830632).

85661258 is a wasteful number, since it uses less digits than its factorization.

85661258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42830631.

The product of its digits is 115200, while the sum is 41.

The square root of 85661258 is about 9255.3367307732. The cubic root of 85661258 is about 440.8201953466.

The spelling of 85661258 in words is "eighty-five million, six hundred sixty-one thousand, two hundred fifty-eight".