55005003991 has 4 divisors (see below), whose sum is σ = 62862861712. Its totient is φ = 47147146272.

The previous prime is 55005003959. The next prime is 55005004013. The reversal of 55005003991 is 19930050055.

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 55005003991 - 2⁵ = 55005003959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55005003991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55005004991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3928928850 + ... + 3928928863.

It is an arithmetic number, because the mean of its divisors is an integer number (15715715428).

Almost surely, 2^55005003991 is an apocalyptic number.

55005003991 is a deficient number, since it is larger than the sum of its proper divisors (7857857721).

55005003991 is an equidigital number, since it uses as much as digits as its factorization.

55005003991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7857857720.

The product of its (nonzero) digits is 30375, while the sum is 37.

The spelling of 55005003991 in words is "fifty-five billion, five million, three thousand, nine hundred ninety-one".