1868655537450 has 240 divisors, whose sum is σ = 5696994103416. Its totient is φ = 451297267200.

The previous prime is 1868655537361. The next prime is 1868655537451. The reversal of 1868655537450 is 547355568681.

1868655537450 is a `hidden beast` number, since 1 + 8 + 6 + 8 + 6 + 5 + 553 + 74 + 5 + 0 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 188549613729 + 1680105923721 = 434223^2 + 1296189^2 .

It is not an unprimeable number, because it can be changed into a prime (1868655537451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2455620 + ... + 3125280.

Almost surely, 2^{1868655537450} is an apocalyptic number.

1868655537450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1868655537450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2848497051708).

1868655537450 is an abundant number, since it is smaller than the sum of its proper divisors (3828338565966).

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

1868655537450 is a wasteful number, since it uses less digits than its factorization.

1868655537450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669751 (or 669737 counting only the distinct ones).

The product of its (nonzero) digits is 120960000, while the sum is 63.

The spelling of 1868655537450 in words is "one trillion, eight hundred sixty-eight billion, six hundred fifty-five million, five hundred thirty-seven thousand, four hundred fifty".