66381542010 has 384 divisors, whose sum is σ = 217385925120. Its totient is φ = 14249862144.

The previous prime is 66381541949. The next prime is 66381542027. The reversal of 66381542010 is 1024518366.

It is a happy number.

66381542010 is a `hidden beast` number, since 6 + 638 + 1 + 5 + 4 + 2 + 0 + 10 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 18249912 + ... + 18253548.

It is an arithmetic number, because the mean of its divisors is an integer number (566109180).

Almost surely, 2^66381542010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66381542010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108692962560).

66381542010 is an abundant number, since it is smaller than the sum of its proper divisors (151004383110).

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

66381542010 is a wasteful number, since it uses less digits than its factorization.

66381542010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3732 (or 3720 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 66381542010 in words is "sixty-six billion, three hundred eighty-one million, five hundred forty-two thousand, ten".