1866360357904 has 135 divisors (see below), whose sum is σ = 4258731676797. Its totient is φ = 790048852992.

The previous prime is 1866360357881. The next prime is 1866360357913. The reversal of 1866360357904 is 4097530636681.

It is a happy number.

The square root of 1866360357904 is 1366148.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 838067011600 + 1028293346304 = 915460^2 + 1014048^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3710457717 + ... + 3710458219.

Almost surely, 2^{1866360357904} is an apocalyptic number.

1866360357904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1866360357904 is the 1366148-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866360357904

1866360357904 is an abundant number, since it is smaller than the sum of its proper divisors (2392371318893).

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

1866360357904 is an frugal number, since it uses more digits than its factorization.

1866360357904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 58.

The spelling of 1866360357904 in words is "one trillion, eight hundred sixty-six billion, three hundred sixty million, three hundred fifty-seven thousand, nine hundred four".