1977193845079 has 2 divisors, whose sum is σ = 1977193845080. Its totient is φ = 1977193845078.

The previous prime is 1977193845061. The next prime is 1977193845113. The reversal of 1977193845079 is 9705483917791.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1977193845079 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1977193844999 and 1977193845017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1977193545079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 988596922539 + 988596922540.

It is an arithmetic number, because the mean of its divisors is an integer number (988596922540).

Almost surely, 2^{1977193845079} is an apocalyptic number.

1977193845079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1977193845079 is an equidigital number, since it uses as much as digits as its factorization.

1977193845079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120022560, while the sum is 70.

The spelling of 1977193845079 in words is "one trillion, nine hundred seventy-seven billion, one hundred ninety-three million, eight hundred forty-five thousand, seventy-nine".