1866144416 has 24 divisors (see below), whose sum is σ = 3743295444. Its totient is φ = 915466240.

The previous prime is 1866144409. The next prime is 1866144437. The reversal of 1866144416 is 6144416681.

It can be written as a sum of positive squares in 2 ways, for example, as 1865894416 + 250000 = 43196^2 + 500^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548465 + ... + 551856.

Almost surely, 2^1866144416 is an apocalyptic number.

1866144416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1866144416 is an abundant number, since it is smaller than the sum of its proper divisors (1877151028).

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

1866144416 is a wasteful number, since it uses less digits than its factorization.

1866144416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100384 (or 1100376 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 1866144416 is about 43198.8936895379. The cubic root of 1866144416 is about 1231.1616619144.

The spelling of 1866144416 in words is "one billion, eight hundred sixty-six million, one hundred forty-four thousand, four hundred sixteen".