54843618521 has 4 divisors (see below), whose sum is σ = 55078999092. Its totient is φ = 54608237952.

The previous prime is 54843618517. The next prime is 54843618539. The reversal of 54843618521 is 12581634845.

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 15242618521 + 39601000000 = 123461^2 + 199000^2 .

It is a cyclic number.

It is not a de Polignac number, because 54843618521 - 2² = 54843618517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54843618551) 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, 117689936 + ... + 117690401.

It is an arithmetic number, because the mean of its divisors is an integer number (13769749773).

Almost surely, 2^54843618521 is an apocalyptic number.

It is an amenable number.

54843618521 is a deficient number, since it is larger than the sum of its proper divisors (235380571).

54843618521 is a wasteful number, since it uses less digits than its factorization.

54843618521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235380570.

The product of its digits is 921600, while the sum is 47.

The spelling of 54843618521 in words is "fifty-four billion, eight hundred forty-three million, six hundred eighteen thousand, five hundred twenty-one".