1205866643380 has 96 divisors (see below), whose sum is σ = 3010961866752. Its totient is φ = 396952617600.

The previous prime is 1205866643323. The next prime is 1205866643383. The reversal of 1205866643380 is 833466685021.

It is a super-2 number, since 2×1205866643380² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205866643383) 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 31 ways as a sum of consecutive naturals, for example, 542716 + ... + 1645075.

It is an arithmetic number, because the mean of its divisors is an integer number (31364186112).

Almost surely, 2^{1205866643380} is an apocalyptic number.

1205866643380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205866643380 is an abundant number, since it is smaller than the sum of its proper divisors (1805095223372).

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

1205866643380 is a wasteful number, since it uses less digits than its factorization.

1205866643380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187965 (or 2187963 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 1205866643380 in words is "one trillion, two hundred five billion, eight hundred sixty-six million, six hundred forty-three thousand, three hundred eighty".