83556661 has 8 divisors (see below), whose sum is σ = 88045920. Its totient is φ = 79076592.

The previous prime is 83556601. The next prime is 83556689. The reversal of 83556661 is 16665538.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83556661 - 2¹¹ = 83554613 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 (83556601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24486 + ... + 27688.

It is an arithmetic number, because the mean of its divisors is an integer number (11005740).

Almost surely, 2^83556661 is an apocalyptic number.

It is an amenable number.

83556661 is a deficient number, since it is larger than the sum of its proper divisors (4489259).

83556661 is a wasteful number, since it uses less digits than its factorization.

83556661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4595.

The product of its digits is 129600, while the sum is 40.

The square root of 83556661 is about 9140.9332674514. The cubic root of 83556661 is about 437.1800736995.

The spelling of 83556661 in words is "eighty-three million, five hundred fifty-six thousand, six hundred sixty-one".