1205655606553 has 8 divisors (see below), whose sum is σ = 1209013157000. Its totient is φ = 1202298726528.

The previous prime is 1205655606497. The next prime is 1205655606577. The reversal of 1205655606553 is 3556065565021.

It can be written as a sum of positive squares in 4 ways, for example, as 118999471369 + 1086656135184 = 344963^2 + 1042428^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1205655606553 is a prime.

It is a super-2 number, since 2×1205655606553² (a number of 25 digits) contains 22 as substring.

It is the 1098024-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1205655606497 and 1205655606506.

It is not an unprimeable number, because it can be changed into a prime (1205655606053) by changing a digit.

It is a nontrivial repunit in base 1098023.

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 7 ways as a sum of consecutive naturals, for example, 3548533 + ... + 3873421.

It is an arithmetic number, because the mean of its divisors is an integer number (151126644625).

Almost surely, 2^{1205655606553} is an apocalyptic number.

It is an amenable number.

1205655606553 is a deficient number, since it is larger than the sum of its proper divisors (3357550447).

1205655606553 is an equidigital number, since it uses as much as digits as its factorization.

1205655606553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335211.

The product of its (nonzero) digits is 4050000, while the sum is 49.

The spelling of 1205655606553 in words is "one trillion, two hundred five billion, six hundred fifty-five million, six hundred six thousand, five hundred fifty-three".