83661845 has 16 divisors (see below), whose sum is σ = 111896640. Its totient is φ = 59675904.

The previous prime is 83661829. The next prime is 83661857. The reversal of 83661845 is 54816638.

It is a cyclic number.

It is not a de Polignac number, because 83661845 - 2⁴ = 83661829 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24287 + ... + 27516.

It is an arithmetic number, because the mean of its divisors is an integer number (6993540).

Almost surely, 2^83661845 is an apocalyptic number.

83661845 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

83661845 is a deficient number, since it is larger than the sum of its proper divisors (28234795).

83661845 is a wasteful number, since it uses less digits than its factorization.

83661845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51844.

The product of its digits is 138240, while the sum is 41.

The square root of 83661845 is about 9146.6849185921. The cubic root of 83661845 is about 437.3634425506.

The spelling of 83661845 in words is "eighty-three million, six hundred sixty-one thousand, eight hundred forty-five".