55144641647 has 4 divisors (see below), whose sum is σ = 55175502216. Its totient is φ = 55113781080.

The previous prime is 55144641631. The next prime is 55144641707. The reversal of 55144641647 is 74614644155.

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 55144641647 - 2⁴ = 55144641631 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 (55144641347) 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, 15427604 + ... + 15431177.

It is an arithmetic number, because the mean of its divisors is an integer number (13793875554).

Almost surely, 2^55144641647 is an apocalyptic number.

55144641647 is a deficient number, since it is larger than the sum of its proper divisors (30860569).

55144641647 is a wasteful number, since it uses less digits than its factorization.

55144641647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30860568.

The product of its digits is 1612800, while the sum is 47.

The spelling of 55144641647 in words is "fifty-five billion, one hundred forty-four million, six hundred forty-one thousand, six hundred forty-seven".