55611311311656 has 128 divisors (see below), whose sum is σ = 163584264096000. Its totient is φ = 17444383635456.

The previous prime is 55611311311651. The next prime is 55611311311669. The reversal of 55611311311656 is 65611311311655.

55611311311656 is a `hidden beast` number, since 5 + 5 + 6 + 11 + 311 + 311 + 6 + 5 + 6 = 666.

It is a super-2 number, since 2×55611311311656² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55611311311651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26937460 + ... + 28928348.

It is an arithmetic number, because the mean of its divisors is an integer number (1278002063250).

Almost surely, 2^{55611311311656} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55611311311656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81792132048000).

55611311311656 is an abundant number, since it is smaller than the sum of its proper divisors (107972952784344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55611311311656 is a wasteful number, since it uses less digits than its factorization.

55611311311656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998528 (or 1998518 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

Subtracting 55611311311656 from its reverse (65611311311655), we obtain a palindrome (9999999999999).

The spelling of 55611311311656 in words is "fifty-five trillion, six hundred eleven billion, three hundred eleven million, three hundred eleven thousand, six hundred fifty-six".