55550555591 has 2 divisors, whose sum is σ = 55550555592. Its totient is φ = 55550555590.

The previous prime is 55550555573. The next prime is 55550555639. The reversal of 55550555591 is 19555505555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55550555591 - 2¹⁴ = 55550539207 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55550555551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27775277795 + 27775277796.

It is an arithmetic number, because the mean of its divisors is an integer number (27775277796).

Almost surely, 2^55550555591 is an apocalyptic number.

55550555591 is a deficient number, since it is larger than the sum of its proper divisors (1).

55550555591 is an equidigital number, since it uses as much as digits as its factorization.

55550555591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3515625, while the sum is 50.

The spelling of 55550555591 in words is "fifty-five billion, five hundred fifty million, five hundred fifty-five thousand, five hundred ninety-one".