66665161100 has 72 divisors (see below), whose sum is σ = 146657050848. Its totient is φ = 26300608000.

The previous prime is 66665161097. The next prime is 66665161103. The reversal of 66665161100 is 116156666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66665161097) and next prime (66665161103).

It is not an unprimeable number, because it can be changed into a prime (66665161103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2643752 + ... + 2668848.

It is an arithmetic number, because the mean of its divisors is an integer number (2036903484).

Almost surely, 2^66665161100 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 66665161100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73328525424).

66665161100 is an abundant number, since it is smaller than the sum of its proper divisors (79991889748).

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

66665161100 is a wasteful number, since it uses less digits than its factorization.

66665161100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25475 (or 25468 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 66665161100 in words is "sixty-six billion, six hundred sixty-five million, one hundred sixty-one thousand, one hundred".