86166621 has 6 divisors (see below), whose sum is σ = 124462910. Its totient is φ = 57444408.

The previous prime is 86166617. The next prime is 86166631. The reversal of 86166621 is 12666168.

It can be written as a sum of positive squares in only one way, i.e., 59074596 + 27092025 = 7686^2 + 5205^2 .

It is not a de Polignac number, because 86166621 - 2² = 86166617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86166631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4787026 + ... + 4787043.

Almost surely, 2^86166621 is an apocalyptic number.

It is an amenable number.

86166621 is a deficient number, since it is larger than the sum of its proper divisors (38296289).

86166621 is a wasteful number, since it uses less digits than its factorization.

86166621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9574075 (or 9574072 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 86166621 is about 9282.5977506299. The cubic root of 86166621 is about 441.6853766529.

The spelling of 86166621 in words is "eighty-six million, one hundred sixty-six thousand, six hundred twenty-one".