86661350689 has 3 divisors (see below), whose sum is σ = 86661645073. Its totient is φ = 86661056306.

The previous prime is 86661350669. The next prime is 86661350701. The reversal of 86661350689 is 98605316668.

The square root of 86661350689 is 294383.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 86661350689 - 2³¹ = 84513867041 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86661350669) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 147192 + ... + 441574.

Almost surely, 2^86661350689 is an apocalyptic number.

86661350689 is the 294383-rd square number.

86661350689 is the 147192-nd centered octagonal number.

It is an amenable number.

86661350689 is a deficient number, since it is larger than the sum of its proper divisors (294384).

86661350689 is an frugal number, since it uses more digits than its factorization.

86661350689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588766 (or 294383 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 58.

The spelling of 86661350689 in words is "eighty-six billion, six hundred sixty-one million, three hundred fifty thousand, six hundred eighty-nine".