83645654639 has 4 divisors (see below), whose sum is σ = 87282422256. Its totient is φ = 80008887024.

The previous prime is 83645654629. The next prime is 83645654773. The reversal of 83645654639 is 93645654638.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 83645654639 - 2⁴ = 83645654623 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 (83645654629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1818383774 + ... + 1818383819.

It is an arithmetic number, because the mean of its divisors is an integer number (21820605564).

Almost surely, 2^83645654639 is an apocalyptic number.

83645654639 is a deficient number, since it is larger than the sum of its proper divisors (3636767617).

83645654639 is a wasteful number, since it uses less digits than its factorization.

83645654639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636767616.

The product of its digits is 55987200, while the sum is 59.

Subtracting 83645654639 from its reverse (93645654638), we obtain a palindrome (9999999999).

The spelling of 83645654639 in words is "eighty-three billion, six hundred forty-five million, six hundred fifty-four thousand, six hundred thirty-nine".