8356661 has 4 divisors (see below), whose sum is σ = 8560524. Its totient is φ = 8152800.

The previous prime is 8356651. The next prime is 8356679. The reversal of 8356661 is 1666538.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1666538 = 2 ⋅833269.

It can be written as a sum of positive squares in 2 ways, for example, as 1674436 + 6682225 = 1294^2 + 2585^2 .

It is a cyclic number.

It is not a de Polignac number, because 8356661 - 2⁶ = 8356597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8356631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101870 + ... + 101951.

It is an arithmetic number, because the mean of its divisors is an integer number (2140131).

Almost surely, 2^8356661 is an apocalyptic number.

It is an amenable number.

8356661 is a deficient number, since it is larger than the sum of its proper divisors (203863).

8356661 is a wasteful number, since it uses less digits than its factorization.

8356661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203862.

The product of its digits is 25920, while the sum is 35.

The square root of 8356661 is about 2890.7889926454. The cubic root of 8356661 is about 202.9290683774.

The spelling of 8356661 in words is "eight million, three hundred fifty-six thousand, six hundred sixty-one".