55005203391 has 4 divisors (see below), whose sum is σ = 73340271192. Its totient is φ = 36670135592.

The previous prime is 55005203387. The next prime is 55005203413. The reversal of 55005203391 is 19330250055.

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 55005203391 - 2² = 55005203387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55005203371) 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, 9167533896 + ... + 9167533901.

It is an arithmetic number, because the mean of its divisors is an integer number (18335067798).

Almost surely, 2^55005203391 is an apocalyptic number.

55005203391 is a deficient number, since it is larger than the sum of its proper divisors (18335067801).

55005203391 is a wasteful number, since it uses less digits than its factorization.

55005203391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18335067800.

The product of its (nonzero) digits is 20250, while the sum is 33.

The spelling of 55005203391 in words is "fifty-five billion, five million, two hundred three thousand, three hundred ninety-one".