66385700 has 18 divisors (see below), whose sum is σ = 144057186. Its totient is φ = 26554240.

The previous prime is 66385681. The next prime is 66385717. The reversal of 66385700 is 758366.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3912484 + 62473216 = 1978^2 + 7904^2 .

It is a super-2 number, since 2×66385700² = 8814122328980000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 331829 + ... + 332028.

It is an arithmetic number, because the mean of its divisors is an integer number (8003177).

Almost surely, 2^66385700 is an apocalyptic number.

It is an amenable number.

66385700 is an abundant number, since it is smaller than the sum of its proper divisors (77671486).

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

66385700 is a wasteful number, since it uses less digits than its factorization.

66385700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663871 (or 663864 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 66385700 is about 8147.7420184981. The cubic root of 66385700 is about 404.9096989143.

The spelling of 66385700 in words is "sixty-six million, three hundred eighty-five thousand, seven hundred".