66203380 has 12 divisors (see below), whose sum is σ = 139027140. Its totient is φ = 26481344.

The previous prime is 66203377. The next prime is 66203381. The reversal of 66203380 is 8330266.

It can be written as a sum of positive squares in 2 ways, for example, as 6666724 + 59536656 = 2582^2 + 7716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66203381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655065 + ... + 1655104.

It is an arithmetic number, because the mean of its divisors is an integer number (11585595).

Almost surely, 2^66203380 is an apocalyptic number.

It is an amenable number.

66203380 is an abundant number, since it is smaller than the sum of its proper divisors (72823760).

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

66203380 is a wasteful number, since it uses less digits than its factorization.

66203380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310178 (or 3310176 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66203380 is about 8136.5459502175. The cubic root of 66203380 is about 404.5386811520.

It can be divided in two parts, 6620 and 3380, that added together give a 4-th power (10000 = 10⁴).

The spelling of 66203380 in words is "sixty-six million, two hundred three thousand, three hundred eighty".