55542617121231 has 32 divisors (see below), whose sum is σ = 82425218618880. Its totient is φ = 36965483932608.

The previous prime is 55542617121217. The next prime is 55542617121239. The reversal of 55542617121231 is 13212171624555.

55542617121231 is a `hidden beast` number, since 5 + 5 + 5 + 4 + 2 + 617 + 1 + 2 + 1 + 23 + 1 = 666.

It is not a de Polignac number, because 55542617121231 - 2¹⁵ = 55542617088463 is a prime.

It is a super-2 number, since 2×55542617121231² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55542617121239) 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, 222556140 + ... + 222805566.

It is an arithmetic number, because the mean of its divisors is an integer number (2575788081840).

Almost surely, 2^{55542617121231} is an apocalyptic number.

55542617121231 is a deficient number, since it is larger than the sum of its proper divisors (26882601497649).

55542617121231 is a wasteful number, since it uses less digits than its factorization.

55542617121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263420 (or 263414 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

Adding to 55542617121231 its reverse (13212171624555), we get a palindrome (68754788745786).

The spelling of 55542617121231 in words is "fifty-five trillion, five hundred forty-two billion, six hundred seventeen million, one hundred twenty-one thousand, two hundred thirty-one".