84006661 has 4 divisors (see below), whose sum is σ = 84073024. Its totient is φ = 83940300.

The previous prime is 84006617. The next prime is 84006701. The reversal of 84006661 is 16660048.

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 a cyclic number.

It is not a de Polignac number, because 84006661 - 2⁹ = 84006149 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 (84006161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31245 + ... + 33826.

It is an arithmetic number, because the mean of its divisors is an integer number (21018256).

Almost surely, 2^84006661 is an apocalyptic number.

It is an amenable number.

84006661 is a deficient number, since it is larger than the sum of its proper divisors (66363).

84006661 is a wasteful number, since it uses less digits than its factorization.

84006661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66362.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 84006661 is about 9165.5147700497. The cubic root of 84006661 is about 437.9634898642.

The spelling of 84006661 in words is "eighty-four million, six thousand, six hundred sixty-one".