55550555551 has 2 divisors, whose sum is σ = 55550555552. Its totient is φ = 55550555550.

The previous prime is 55550555503. The next prime is 55550555573. The reversal of 55550555551 is 15555505555.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55550555551 - 2¹⁹ = 55550031263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55550555591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27775277775 + 27775277776.

It is an arithmetic number, because the mean of its divisors is an integer number (27775277776).

Almost surely, 2^55550555551 is an apocalyptic number.

55550555551 is a deficient number, since it is larger than the sum of its proper divisors (1).

55550555551 is an equidigital number, since it uses as much as digits as its factorization.

55550555551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1953125, while the sum is 46.

The spelling of 55550555551 in words is "fifty-five billion, five hundred fifty million, five hundred fifty-five thousand, five hundred fifty-one".