55143231557 has 4 divisors (see below), whose sum is σ = 55423146636. Its totient is φ = 54863316480.

The previous prime is 55143231527. The next prime is 55143231581. The reversal of 55143231557 is 75513234155.

55143231557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34793067841 + 20350163716 = 186529^2 + 142654^2 .

It is a cyclic number.

It is not a de Polignac number, because 55143231557 - 2²⁰ = 55142182981 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 (55143231527) 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, 139957244 + ... + 139957637.

It is an arithmetic number, because the mean of its divisors is an integer number (13855786659).

Almost surely, 2^55143231557 is an apocalyptic number.

It is an amenable number.

55143231557 is a deficient number, since it is larger than the sum of its proper divisors (279915079).

55143231557 is a wasteful number, since it uses less digits than its factorization.

55143231557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279915078.

The product of its digits is 315000, while the sum is 41.

The spelling of 55143231557 in words is "fifty-five billion, one hundred forty-three million, two hundred thirty-one thousand, five hundred fifty-seven".