84065661 has 16 divisors (see below), whose sum is σ = 124924800. Its totient is φ = 55871424.

The previous prime is 84065659. The next prime is 84065699. The reversal of 84065661 is 16656048.

It is not a de Polignac number, because 84065661 - 2¹ = 84065659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84067661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4480 + ... + 13718.

It is an arithmetic number, because the mean of its divisors is an integer number (7807800).

Almost surely, 2^84065661 is an apocalyptic number.

It is an amenable number.

84065661 is a deficient number, since it is larger than the sum of its proper divisors (40859139).

84065661 is a wasteful number, since it uses less digits than its factorization.

84065661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9585 (or 9579 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 84065661 is about 9168.7327913949. The cubic root of 84065661 is about 438.0659968107.

The spelling of 84065661 in words is "eighty-four million, sixty-five thousand, six hundred sixty-one".