655243844439 has 4 divisors (see below), whose sum is σ = 873658459256. Its totient is φ = 436829229624.

The previous prime is 655243844407. The next prime is 655243844467. The reversal of 655243844439 is 934448342556.

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

It is not a de Polignac number, because 655243844439 - 2⁵ = 655243844407 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 (655243844839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109207307404 + ... + 109207307409.

It is an arithmetic number, because the mean of its divisors is an integer number (218414614814).

Almost surely, 2^655243844439 is an apocalyptic number.

655243844439 is a deficient number, since it is larger than the sum of its proper divisors (218414614817).

655243844439 is a wasteful number, since it uses less digits than its factorization.

655243844439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218414614816.

The product of its digits is 49766400, while the sum is 57.

The spelling of 655243844439 in words is "six hundred fifty-five billion, two hundred forty-three million, eight hundred forty-four thousand, four hundred thirty-nine".