85666666658 has 4 divisors (see below), whose sum is σ = 128499999990. Its totient is φ = 42833333328.

The previous prime is 85666666643. The next prime is 85666666667.

85666666658 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 64433222569 + 21233444089 = 253837^2 + 145717^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21416666663 + ... + 21416666666.

Almost surely, 2^85666666658 is an apocalyptic number.

85666666658 is a deficient number, since it is larger than the sum of its proper divisors (42833333332).

85666666658 is a wasteful number, since it uses less digits than its factorization.

85666666658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42833333331.

The product of its digits is 447897600, while the sum is 68.

The spelling of 85666666658 in words is "eighty-five billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred fifty-eight".