6977981878529 has 2 divisors, whose sum is σ = 6977981878530. Its totient is φ = 6977981878528.

The previous prime is 6977981878459. The next prime is 6977981878613. The reversal of 6977981878529 is 9258781897796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4907399020225 + 2070582858304 = 2215265^2 + 1438952^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6977981878529 is a prime.

It is a super-2 number, since 2×6977981878529² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6977981778529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3488990939264 + 3488990939265.

It is an arithmetic number, because the mean of its divisors is an integer number (3488990939265).

Almost surely, 2^{6977981878529} is an apocalyptic number.

It is an amenable number.

6977981878529 is a deficient number, since it is larger than the sum of its proper divisors (1).

6977981878529 is an equidigital number, since it uses as much as digits as its factorization.

6977981878529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7681443840, while the sum is 86.

The spelling of 6977981878529 in words is "six trillion, nine hundred seventy-seven billion, nine hundred eighty-one million, eight hundred seventy-eight thousand, five hundred twenty-nine".