55581992064 has 192 divisors, whose sum is σ = 165720297600. Its totient is φ = 17860147200.

The previous prime is 55581992041. The next prime is 55581992083. The reversal of 55581992064 is 46029918555.

55581992064 is a `hidden beast` number, since 5 + 558 + 1 + 9 + 9 + 20 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a self number, because there is not a number n which added to its sum of digits gives 55581992064.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35111017 + ... + 35112599.

It is an arithmetic number, because the mean of its divisors is an integer number (863126550).

Almost surely, 2^55581992064 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 55581992064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82860148800).

55581992064 is an abundant number, since it is smaller than the sum of its proper divisors (110138305536).

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

55581992064 is a wasteful number, since it uses less digits than its factorization.

55581992064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683 (or 2668 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 54.

The spelling of 55581992064 in words is "fifty-five billion, five hundred eighty-one million, nine hundred ninety-two thousand, sixty-four".