1675165639681 has 4 divisors (see below), whose sum is σ = 1675171934932. Its totient is φ = 1675159344432.

The previous prime is 1675165639669. The next prime is 1675165639691. The reversal of 1675165639681 is 1869365615761.

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 789270551281 + 885895088400 = 888409^2 + 941220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1675165639681 is a prime.

It is a super-2 number, since 2×1675165639681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1675165639601) 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, 2730006 + ... + 3286831.

It is an arithmetic number, because the mean of its divisors is an integer number (418792983733).

Almost surely, 2^{1675165639681} is an apocalyptic number.

It is an amenable number.

1675165639681 is a deficient number, since it is larger than the sum of its proper divisors (6295251).

1675165639681 is an equidigital number, since it uses as much as digits as its factorization.

1675165639681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6295250.

The product of its digits is 48988800, while the sum is 64.

The spelling of 1675165639681 in words is "one trillion, six hundred seventy-five billion, one hundred sixty-five million, six hundred thirty-nine thousand, six hundred eighty-one".