1866121330 has 16 divisors (see below), whose sum is σ = 3505063104. Its totient is φ = 713994160.

The previous prime is 1866121289. The next prime is 1866121339. The reversal of 1866121330 is 331216681.

1866121330 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1866121292 and 1866121301.

It is not an unprimeable number, because it can be changed into a prime (1866121339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4056556 + ... + 4057015.

It is an arithmetic number, because the mean of its divisors is an integer number (219066444).

Almost surely, 2^1866121330 is an apocalyptic number.

1866121330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1866121330 is a deficient number, since it is larger than the sum of its proper divisors (1638941774).

1866121330 is a wasteful number, since it uses less digits than its factorization.

1866121330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8113601.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1866121330 is about 43198.6264827946. The cubic root of 1866121330 is about 1231.1565850091.

The spelling of 1866121330 in words is "one billion, eight hundred sixty-six million, one hundred twenty-one thousand, three hundred thirty".