66531168054 has 96 divisors (see below), whose sum is σ = 157932684000. Its totient is φ = 20118564864.

The previous prime is 66531168047. The next prime is 66531168071. The reversal of 66531168054 is 45086113566.

66531168054 is a `hidden beast` number, since 6 + 6 + 531 + 1 + 68 + 0 + 54 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3739572 + ... + 3757320.

It is an arithmetic number, because the mean of its divisors is an integer number (1645132125).

Almost surely, 2^66531168054 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66531168054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78966342000).

66531168054 is an abundant number, since it is smaller than the sum of its proper divisors (91401515946).

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

66531168054 is a wasteful number, since it uses less digits than its factorization.

66531168054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18046 (or 18043 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 66531168054 in words is "sixty-six billion, five hundred thirty-one million, one hundred sixty-eight thousand, fifty-four".