5545554991 has 2 divisors, whose sum is σ = 5545554992. Its totient is φ = 5545554990.

The previous prime is 5545554983. The next prime is 5545555031. The reversal of 5545554991 is 1994555455.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5545554991 - 2³ = 5545554983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5545554901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2772777495 + 2772777496.

It is an arithmetic number, because the mean of its divisors is an integer number (2772777496).

Almost surely, 2^5545554991 is an apocalyptic number.

5545554991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5545554991 is an equidigital number, since it uses as much as digits as its factorization.

5545554991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4050000, while the sum is 52.

The square root of 5545554991 is about 74468.4832059845. The cubic root of 5545554991 is about 1770.0342584366.

The spelling of 5545554991 in words is "five billion, five hundred forty-five million, five hundred fifty-four thousand, nine hundred ninety-one".