55055555551 has 16 divisors (see below), whose sum is σ = 58339971360. Its totient is φ = 51895509120.

The previous prime is 55055555539. The next prime is 55055555563. The reversal of 55055555551 is 15555555055.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55055555539) and next prime (55055555563).

It is a cyclic number.

It is not a de Polignac number, because 55055555551 - 2¹⁵ = 55055522783 is a prime.

It is a super-2 number, since 2×55055555551² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55055555501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58996 + ... + 337033.

It is an arithmetic number, because the mean of its divisors is an integer number (3646248210).

Almost surely, 2^55055555551 is an apocalyptic number.

55055555551 is a deficient number, since it is larger than the sum of its proper divisors (3284415809).

55055555551 is a wasteful number, since it uses less digits than its factorization.

55055555551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396186.

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

The spelling of 55055555551 in words is "fifty-five billion, fifty-five million, five hundred fifty-five thousand, five hundred fifty-one".