8180661 has 4 divisors (see below), whose sum is σ = 10907552. Its totient is φ = 5453772.

The previous prime is 8180611. The next prime is 8180671. The reversal of 8180661 is 1660818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8180661 - 2⁶ = 8180597 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 (8180611) 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, 1363441 + ... + 1363446.

It is an arithmetic number, because the mean of its divisors is an integer number (2726888).

Almost surely, 2^8180661 is an apocalyptic number.

It is an amenable number.

8180661 is a deficient number, since it is larger than the sum of its proper divisors (2726891).

8180661 is a wasteful number, since it uses less digits than its factorization.

8180661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726890.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 8180661 is about 2860.1854834958. The cubic root of 8180661 is about 201.4943156308.

The spelling of 8180661 in words is "eight million, one hundred eighty thousand, six hundred sixty-one".