1977874787791 has 16 divisors (see below), whose sum is σ = 2283086514240. Its totient is φ = 1678331692800.

The previous prime is 1977874787719. The next prime is 1977874787809.

1977874787791 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1977874787791 - 2⁷ = 1977874787663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1977874781791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5793355 + ... + 6125251.

It is an arithmetic number, because the mean of its divisors is an integer number (142692907140).

Almost surely, 2^{1977874787791} is an apocalyptic number.

1977874787791 is a deficient number, since it is larger than the sum of its proper divisors (305211726449).

1977874787791 is a wasteful number, since it uses less digits than its factorization.

1977874787791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340434.

The product of its digits is 2439569664, while the sum is 82.

The spelling of 1977874787791 in words is "one trillion, nine hundred seventy-seven billion, eight hundred seventy-four million, seven hundred eighty-seven thousand, seven hundred ninety-one".