6937778777397 has 16 divisors (see below), whose sum is σ = 10395066530688. Its totient is φ = 4083776136000.

The previous prime is 6937778777393. The next prime is 6937778777453. The reversal of 6937778777397 is 7937778777396.

It is a happy number.

It is not a de Polignac number, because 6937778777397 - 2² = 6937778777393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6937778777393) 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, 3867211354 + ... + 3867213147.

It is an arithmetic number, because the mean of its divisors is an integer number (649691658168).

Almost surely, 2^{6937778777397} is an apocalyptic number.

It is an amenable number.

6937778777397 is a deficient number, since it is larger than the sum of its proper divisors (3457287753291).

6937778777397 is a wasteful number, since it uses less digits than its factorization.

6937778777397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7734424540.

The product of its digits is 28817416656, while the sum is 87.

Subtracting 6937778777397 from its reverse (7937778777396), we obtain a palindrome (999999999999).

The spelling of 6937778777397 in words is "six trillion, nine hundred thirty-seven billion, seven hundred seventy-eight million, seven hundred seventy-seven thousand, three hundred ninety-seven".