55005005551 has 2 divisors, whose sum is σ = 55005005552. Its totient is φ = 55005005550.

The previous prime is 55005005507. The next prime is 55005005579. The reversal of 55005005551 is 15550050055.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55005005551 - 2¹¹ = 55005003503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55005005351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27502502775 + 27502502776.

It is an arithmetic number, because the mean of its divisors is an integer number (27502502776).

Almost surely, 2^55005005551 is an apocalyptic number.

55005005551 is a deficient number, since it is larger than the sum of its proper divisors (1).

55005005551 is an equidigital number, since it uses as much as digits as its factorization.

55005005551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15625, while the sum is 31.

The spelling of 55005005551 in words is "fifty-five billion, five million, five thousand, five hundred fifty-one".