66898100 has 36 divisors (see below), whose sum is σ = 145553184. Its totient is φ = 26688480.

The previous prime is 66898081. The next prime is 66898103. The reversal of 66898100 is 189866.

It is a super-2 number, since 2×66898100² = 8950711567220000, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66898103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54089 + ... + 55311.

It is an arithmetic number, because the mean of its divisors is an integer number (4043144).

Almost surely, 2^66898100 is an apocalyptic number.

It is an amenable number.

66898100 is an abundant number, since it is smaller than the sum of its proper divisors (78655084).

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

66898100 is a wasteful number, since it uses less digits than its factorization.

66898100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784 (or 1777 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 66898100 is about 8179.1258701649. The cubic root of 66898100 is about 405.9487992249.

The spelling of 66898100 in words is "sixty-six million, eight hundred ninety-eight thousand, one hundred".