1966636075520 has 40 divisors (see below), whose sum is σ = 4715317284084. Its totient is φ = 786654429184.

The previous prime is 1966636075513. The next prime is 1966636075529. The reversal of 1966636075520 is 255706366691.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1966591131904 + 44943616 = 1402352^2 + 6704^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1966636075529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384106049 + ... + 384111168.

Almost surely, 2^{1966636075520} is an apocalyptic number.

1966636075520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1966636075520 is an abundant number, since it is smaller than the sum of its proper divisors (2748681208564).

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

1966636075520 is an frugal number, since it uses more digits than its factorization.

1966636075520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768217240 (or 768217224 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 56.

The spelling of 1966636075520 in words is "one trillion, nine hundred sixty-six billion, six hundred thirty-six million, seventy-five thousand, five hundred twenty".