55161566504 has 64 divisors (see below), whose sum is σ = 116100864000. Its totient is φ = 24353219520.

The previous prime is 55161566503. The next prime is 55161566519. The reversal of 55161566504 is 40566516155.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (55161566503) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 636617 + ... + 718055.

It is an arithmetic number, because the mean of its divisors is an integer number (1814076000).

Almost surely, 2^55161566504 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 55161566504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58050432000).

55161566504 is an abundant number, since it is smaller than the sum of its proper divisors (60939297496).

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

55161566504 is a wasteful number, since it uses less digits than its factorization.

55161566504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81678 (or 81674 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 44.

The spelling of 55161566504 in words is "fifty-five billion, one hundred sixty-one million, five hundred sixty-six thousand, five hundred four".