6172778338887 has 4 divisors (see below), whose sum is σ = 8230371118520. Its totient is φ = 4115185559256.

The previous prime is 6172778338871. The next prime is 6172778338897. The reversal of 6172778338887 is 7888338772716.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6172778338887 - 2⁴ = 6172778338871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6172778338817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1028796389812 + ... + 1028796389817.

It is an arithmetic number, because the mean of its divisors is an integer number (2057592779630).

Almost surely, 2^{6172778338887} is an apocalyptic number.

6172778338887 is a deficient number, since it is larger than the sum of its proper divisors (2057592779633).

6172778338887 is a wasteful number, since it uses less digits than its factorization.

6172778338887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057592779632.

The product of its digits is 1062125568, while the sum is 75.

The spelling of 6172778338887 in words is "six trillion, one hundred seventy-two billion, seven hundred seventy-eight million, three hundred thirty-eight thousand, eight hundred eighty-seven".