1977067706785 has 4 divisors (see below), whose sum is σ = 2372481248148. Its totient is φ = 1581654165424.

The previous prime is 1977067706743. The next prime is 1977067706797. The reversal of 1977067706785 is 5876077607791.

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 1510064949409 + 467002757376 = 1228847^2 + 683376^2 .

It is a cyclic number.

It is not a de Polignac number, because 1977067706785 - 2¹⁵ = 1977067674017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 197706770674 + ... + 197706770683.

It is an arithmetic number, because the mean of its divisors is an integer number (593120312037).

Almost surely, 2^{1977067706785} is an apocalyptic number.

It is an amenable number.

1977067706785 is a deficient number, since it is larger than the sum of its proper divisors (395413541363).

1977067706785 is an equidigital number, since it uses as much as digits as its factorization.

1977067706785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395413541362.

The product of its (nonzero) digits is 217818720, while the sum is 70.

The spelling of 1977067706785 in words is "one trillion, nine hundred seventy-seven billion, sixty-seven million, seven hundred six thousand, seven hundred eighty-five".