83661655 has 32 divisors (see below), whose sum is σ = 131765760. Its totient is φ = 49403520.

The previous prime is 83661623. The next prime is 83661727. The reversal of 83661655 is 55616638.

It is not a de Polignac number, because 83661655 - 2⁵ = 83661623 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1597 + ... + 13033.

It is an arithmetic number, because the mean of its divisors is an integer number (4117680).

Almost surely, 2^83661655 is an apocalyptic number.

83661655 is a deficient number, since it is larger than the sum of its proper divisors (48104105).

83661655 is a wasteful number, since it uses less digits than its factorization.

83661655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11479.

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

The square root of 83661655 is about 9146.6745323095. The cubic root of 83661655 is about 437.3631114594.

It can be divided in two parts, 8 and 3661655, that added together give a palindrome (3661663).

The spelling of 83661655 in words is "eighty-three million, six hundred sixty-one thousand, six hundred fifty-five".