55045045991 has 4 divisors (see below), whose sum is σ = 59279280312. Its totient is φ = 50810811672.

The previous prime is 55045045981. The next prime is 55045046027. The reversal of 55045045991 is 19954054055.

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 55045045991 - 2²⁶ = 54977937127 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 (55045045931) 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, 2117117141 + ... + 2117117166.

It is an arithmetic number, because the mean of its divisors is an integer number (14819820078).

Almost surely, 2^55045045991 is an apocalyptic number.

55045045991 is a deficient number, since it is larger than the sum of its proper divisors (4234234321).

55045045991 is a wasteful number, since it uses less digits than its factorization.

55045045991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4234234320.

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 55045045991 in words is "fifty-five billion, forty-five million, forty-five thousand, nine hundred ninety-one".