6977981878569 has 27 divisors (see below), whose sum is σ = 10914440487717. Its totient is φ = 4294079296416.

The previous prime is 6977981878529. The next prime is 6977981878613. The reversal of 6977981878569 is 9658781897796.

It is a happy number.

The square root of 6977981878569 is 2641587.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 414752744169 + 6563229134400 = 644013^2 + 2561880^2 .

It is not a de Polignac number, because 6977981878569 - 2¹⁷ = 6977981747497 is a prime.

It is a super-2 number, since 2×6977981878569² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6977981878529) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 102988027 + ... + 103055759.

Almost surely, 2^{6977981878569} is an apocalyptic number.

6977981878569 is the 2641587-th square number.

6977981878569 is the 1320794-th centered octagonal number.

It is an amenable number.

6977981878569 is a deficient number, since it is larger than the sum of its proper divisors (3936458609148).

6977981878569 is an frugal number, since it uses more digits than its factorization.

6977981878569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135498 (or 67749 counting only the distinct ones).

The product of its digits is 23044331520, while the sum is 90.

The spelling of 6977981878569 in words is "six trillion, nine hundred seventy-seven billion, nine hundred eighty-one million, eight hundred seventy-eight thousand, five hundred sixty-nine".