55505504997 has 12 divisors (see below), whose sum is σ = 81001162060. Its totient is φ = 36622188288.

The previous prime is 55505504993. The next prime is 55505505031. The reversal of 55505504997 is 79940550555.

55505504997 is a `hidden beast` number, since 5 + 5 + 505 + 5 + 0 + 49 + 97 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12110782401 + 43394722596 = 110049^2 + 208314^2 .

It is not a de Polignac number, because 55505504997 - 2² = 55505504993 is a prime.

It is a super-2 number, since 2×55505504997² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55505504993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31789222 + ... + 31790967.

Almost surely, 2^55505504997 is an apocalyptic number.

It is an amenable number.

55505504997 is a deficient number, since it is larger than the sum of its proper divisors (25495657063).

55505504997 is a wasteful number, since it uses less digits than its factorization.

55505504997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63580292 (or 63580289 counting only the distinct ones).

The product of its (nonzero) digits is 7087500, while the sum is 54.

The spelling of 55505504997 in words is "fifty-five billion, five hundred five million, five hundred four thousand, nine hundred ninety-seven".