66199380 has 48 divisors (see below), whose sum is σ = 199618944. Its totient is φ = 16295040.

The previous prime is 66199361. The next prime is 66199421. The reversal of 66199380 is 8399166.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41656 + ... + 43215.

It is an arithmetic number, because the mean of its divisors is an integer number (4158728).

Almost surely, 2^66199380 is an apocalyptic number.

66199380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66199380 is an abundant number, since it is smaller than the sum of its proper divisors (133419564).

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

66199380 is a wasteful number, since it uses less digits than its factorization.

66199380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84896 (or 84894 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 66199380 is about 8136.3001419564. The cubic root of 66199380 is about 404.5305335956.

The spelling of 66199380 in words is "sixty-six million, one hundred ninety-nine thousand, three hundred eighty".