83644433444638 has 32 divisors (see below), whose sum is σ = 139583038637952. Its totient is φ = 37268642829600.

The previous prime is 83644433444629. The next prime is 83644433444683.

83644433444638 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 83644433444638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31604256 + ... + 34148467.

It is an arithmetic number, because the mean of its divisors is an integer number (4361969957436).

Almost surely, 2^{83644433444638} is an apocalyptic number.

83644433444638 is a deficient number, since it is larger than the sum of its proper divisors (55938605193314).

83644433444638 is a wasteful number, since it uses less digits than its factorization.

83644433444638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65753880.

The product of its digits is 764411904, while the sum is 64.

The spelling of 83644433444638 in words is "eighty-three trillion, six hundred forty-four billion, four hundred thirty-three million, four hundred forty-four thousand, six hundred thirty-eight".