66043860100 has 81 divisors (see below), whose sum is σ = 148266227151. Its totient is φ = 25534526400.

The previous prime is 66043860083. The next prime is 66043860109. The reversal of 66043860100 is 106834066.

The square root of 66043860100 is 256990.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 286489476 + 65757370624 = 16926^2 + 256432^2 .

It is not an unprimeable number, because it can be changed into a prime (66043860109) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 79666486 + ... + 79667314.

Almost surely, 2^66043860100 is an apocalyptic number.

66043860100 is the 256990-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66043860100

66043860100 is an abundant number, since it is smaller than the sum of its proper divisors (82222367051).

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

66043860100 is an equidigital number, since it uses as much as digits as its factorization.

66043860100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 66043860100 in words is "sixty-six billion, forty-three million, eight hundred sixty thousand, one hundred".