1977981283841 has 4 divisors (see below), whose sum is σ = 1981176730800. Its totient is φ = 1974785836884.

The previous prime is 1977981283741. The next prime is 1977981283871. The reversal of 1977981283841 is 1483821897791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1977981283841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1977981283871) 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, 1597722551 + ... + 1597723788.

It is an arithmetic number, because the mean of its divisors is an integer number (495294182700).

Almost surely, 2^{1977981283841} is an apocalyptic number.

It is an amenable number.

1977981283841 is a deficient number, since it is larger than the sum of its proper divisors (3195446959).

1977981283841 is an equidigital number, since it uses as much as digits as its factorization.

1977981283841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195446958.

The product of its digits is 48771072, while the sum is 68.

The spelling of 1977981283841 in words is "one trillion, nine hundred seventy-seven billion, nine hundred eighty-one million, two hundred eighty-three thousand, eight hundred forty-one".