55405551266565 has 16 divisors (see below), whose sum is σ = 89462174524800. Its totient is φ = 29278529842752.

The previous prime is 55405551266539. The next prime is 55405551266567. The reversal of 55405551266565 is 56566215550455.

It is not a de Polignac number, because 55405551266565 - 2¹⁰ = 55405551265541 is a prime.

It is a super-2 number, since 2×55405551266565² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55405551266499 and 55405551266508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55405551266567) 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, 16943592025 + ... + 16943595294.

It is an arithmetic number, because the mean of its divisors is an integer number (5591385907800).

Almost surely, 2^{55405551266565} is an apocalyptic number.

It is an amenable number.

55405551266565 is a deficient number, since it is larger than the sum of its proper divisors (34056623258235).

55405551266565 is a wasteful number, since it uses less digits than its factorization.

55405551266565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33887187436.

The product of its (nonzero) digits is 135000000, while the sum is 60.

The spelling of 55405551266565 in words is "fifty-five trillion, four hundred five billion, five hundred fifty-one million, two hundred sixty-six thousand, five hundred sixty-five".