55055555005561 has 8 divisors (see below), whose sum is σ = 60906529482048. Its totient is φ = 49345567866000.

The previous prime is 55055555005543. The next prime is 55055555005579. The reversal of 55055555005561 is 16550055555055.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55055555005543) and next prime (55055555005579).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55055555005561 - 2¹⁹ = 55055554481273 is a prime.

It is a super-2 number, since 2×55055555005561² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55055555005499 and 55055555005508.

It is not an unprimeable number, because it can be changed into a prime (55055555000561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35246833410 + ... + 35246834971.

It is an arithmetic number, because the mean of its divisors is an integer number (7613316185256).

Almost surely, 2^{55055555005561} is an apocalyptic number.

It is an amenable number.

55055555005561 is a deficient number, since it is larger than the sum of its proper divisors (5850974476487).

55055555005561 is a wasteful number, since it uses less digits than its factorization.

55055555005561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70493668463.

The product of its (nonzero) digits is 11718750, while the sum is 52.

The spelling of 55055555005561 in words is "fifty-five trillion, fifty-five billion, five hundred fifty-five million, five thousand, five hundred sixty-one".