1798467979681 has 4 divisors (see below), whose sum is σ = 1798530740500. Its totient is φ = 1798405218864.

The previous prime is 1798467979667. The next prime is 1798467979697. The reversal of 1798467979681 is 1869797648971.

It is a happy number.

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 1554051451456 + 244416528225 = 1246616^2 + 494385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1798467979681 is a prime.

It is a super-2 number, since 2×1798467979681² (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 = 1798467979595 and 1798467979604.

It is not an unprimeable number, because it can be changed into a prime (1798467979601) 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, 31337406 + ... + 31394743.

It is an arithmetic number, because the mean of its divisors is an integer number (449632685125).

Almost surely, 2^{1798467979681} is an apocalyptic number.

It is an amenable number.

1798467979681 is a deficient number, since it is larger than the sum of its proper divisors (62760819).

1798467979681 is an equidigital number, since it uses as much as digits as its factorization.

1798467979681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62760818.

The product of its digits is 2304433152, while the sum is 82.

The spelling of 1798467979681 in words is "one trillion, seven hundred ninety-eight billion, four hundred sixty-seven million, nine hundred seventy-nine thousand, six hundred eighty-one".