1670843775961 has 4 divisors (see below), whose sum is σ = 1671047025124. Its totient is φ = 1670640526800.

The previous prime is 1670843775943. The next prime is 1670843775973. The reversal of 1670843775961 is 1695773480761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1394125694361 + 276718081600 = 1180731^2 + 526040^2 .

It is a cyclic number.

It is not a de Polignac number, because 1670843775961 - 2¹⁷ = 1670843644889 is a prime.

It is a super-2 number, since 2×1670843775961² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1670843775893 and 1670843775902.

It is not an unprimeable number, because it can be changed into a prime (1670843775761) 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 3 ways as a sum of consecutive naturals, for example, 101612250 + ... + 101628691.

It is an arithmetic number, because the mean of its divisors is an integer number (417761756281).

Almost surely, 2^{1670843775961} is an apocalyptic number.

It is an amenable number.

1670843775961 is a deficient number, since it is larger than the sum of its proper divisors (203249163).

1670843775961 is an equidigital number, since it uses as much as digits as its factorization.

1670843775961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203249162.

The product of its (nonzero) digits is 53343360, while the sum is 64.

The spelling of 1670843775961 in words is "one trillion, six hundred seventy billion, eight hundred forty-three million, seven hundred seventy-five thousand, nine hundred sixty-one".