55366232321 has 4 divisors (see below), whose sum is σ = 56544237312. Its totient is φ = 54188227332.

The previous prime is 55366232291. The next prime is 55366232381. The reversal of 55366232321 is 12323266355.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55366232321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55366232381) 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, 589002425 + ... + 589002518.

It is an arithmetic number, because the mean of its divisors is an integer number (14136059328).

Almost surely, 2^55366232321 is an apocalyptic number.

It is an amenable number.

55366232321 is a deficient number, since it is larger than the sum of its proper divisors (1178004991).

55366232321 is a wasteful number, since it uses less digits than its factorization.

55366232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178004990.

The product of its digits is 194400, while the sum is 38.

Adding to 55366232321 its reverse (12323266355), we get a palindrome (67689498676).

The spelling of 55366232321 in words is "fifty-five billion, three hundred sixty-six million, two hundred thirty-two thousand, three hundred twenty-one".