1671665561200 has 30 divisors (see below), whose sum is σ = 4016176511744. Its totient is φ = 668666224320.

The previous prime is 1671665561197. The next prime is 1671665561207. The reversal of 1671665561200 is 21655661761.

It is a super-2 number, since 2×1671665561200² (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 (1671665561207) 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 5 ways as a sum of consecutive naturals, for example, 2089581552 + ... + 2089582351.

Almost surely, 2^{1671665561200} is an apocalyptic number.

1671665561200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1671665561200 is an abundant number, since it is smaller than the sum of its proper divisors (2344510950544).

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

1671665561200 is a wasteful number, since it uses less digits than its factorization.

1671665561200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4179163921 (or 4179163910 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 1671665561200 in words is "one trillion, six hundred seventy-one billion, six hundred sixty-five million, five hundred sixty-one thousand, two hundred".