55111055551 has 2 divisors, whose sum is σ = 55111055552. Its totient is φ = 55111055550.

The previous prime is 55111055537. The next prime is 55111055557. The reversal of 55111055551 is 15555011155.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55111055551 - 2¹³ = 55111047359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55111055557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27555527775 + 27555527776.

It is an arithmetic number, because the mean of its divisors is an integer number (27555527776).

Almost surely, 2^55111055551 is an apocalyptic number.

55111055551 is a deficient number, since it is larger than the sum of its proper divisors (1).

55111055551 is an equidigital number, since it uses as much as digits as its factorization.

55111055551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15625, while the sum is 34.

The spelling of 55111055551 in words is "fifty-five billion, one hundred eleven million, fifty-five thousand, five hundred fifty-one".