1665214646020 has 12 divisors (see below), whose sum is σ = 3496950756684. Its totient is φ = 666085858400.

The previous prime is 1665214645993. The next prime is 1665214646021. The reversal of 1665214646020 is 206464125661.

It can be written as a sum of positive squares in 2 ways, for example, as 381657070656 + 1283557575364 = 617784^2 + 1132942^2 .

It is not an unprimeable number, because it can be changed into a prime (1665214646021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41630366131 + ... + 41630366170.

It is an arithmetic number, because the mean of its divisors is an integer number (291412563057).

Almost surely, 2^{1665214646020} is an apocalyptic number.

1665214646020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665214646020 is an abundant number, since it is smaller than the sum of its proper divisors (1831736110664).

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

1665214646020 is a wasteful number, since it uses less digits than its factorization.

1665214646020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83260732310 (or 83260732308 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 1665214646020 in words is "one trillion, six hundred sixty-five billion, two hundred fourteen million, six hundred forty-six thousand, twenty".