55644477439 has 4 divisors (see below), whose sum is σ = 55645511256. Its totient is φ = 55643443624.

The previous prime is 55644477431. The next prime is 55644477443. The reversal of 55644477439 is 93477444655.

It is a happy number.

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 55644477439 - 2³ = 55644477431 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 (55644477431) 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, 431464 + ... + 545389.

It is an arithmetic number, because the mean of its divisors is an integer number (13911377814).

Almost surely, 2^55644477439 is an apocalyptic number.

55644477439 is a deficient number, since it is larger than the sum of its proper divisors (1033817).

55644477439 is an equidigital number, since it uses as much as digits as its factorization.

55644477439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033816.

The product of its digits is 50803200, while the sum is 58.

The spelling of 55644477439 in words is "fifty-five billion, six hundred forty-four million, four hundred seventy-seven thousand, four hundred thirty-nine".