6381979482565 has 16 divisors (see below), whose sum is σ = 7698816241200. Its totient is φ = 5078628237312.

The previous prime is 6381979482533. The next prime is 6381979482577. The reversal of 6381979482565 is 5652849791836.

It is a Cunningham number, because it is equal to 2526258²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 696892709601 + 5685086772964 = 834801^2 + 2384342^2 .

It is a cyclic number.

It is not a de Polignac number, because 6381979482565 - 2⁵ = 6381979482533 is a prime.

It is a super-3 number, since 3×6381979482565³ (a number of 39 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9607501 + ... + 10250269.

It is an arithmetic number, because the mean of its divisors is an integer number (481176015075).

Almost surely, 2^{6381979482565} is an apocalyptic number.

It is an amenable number.

6381979482565 is a deficient number, since it is larger than the sum of its proper divisors (1316836758635).

6381979482565 is a wasteful number, since it uses less digits than its factorization.

6381979482565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653256.

The product of its digits is 783820800, while the sum is 73.

The spelling of 6381979482565 in words is "six trillion, three hundred eighty-one billion, nine hundred seventy-nine million, four hundred eighty-two thousand, five hundred sixty-five".