66542493168 has 160 divisors (see below), whose sum is σ = 202372672320. Its totient is φ = 20862074880.

The previous prime is 66542493131. The next prime is 66542493187. The reversal of 66542493168 is 86139424566.

66542493168 is a `hidden beast` number, since 6 + 6 + 542 + 4 + 9 + 31 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19246896 + ... + 19250352.

It is an arithmetic number, because the mean of its divisors is an integer number (1264829202).

Almost surely, 2^66542493168 is an apocalyptic number.

66542493168 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66542493168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101186336160).

66542493168 is an abundant number, since it is smaller than the sum of its proper divisors (135830179152).

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

66542493168 is a wasteful number, since it uses less digits than its factorization.

66542493168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6112 (or 6100 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The spelling of 66542493168 in words is "sixty-six billion, five hundred forty-two million, four hundred ninety-three thousand, one hundred sixty-eight".