6479966981 has 2 divisors, whose sum is σ = 6479966982. Its totient is φ = 6479966980.

The previous prime is 6479966947. The next prime is 6479967049. The reversal of 6479966981 is 1896699746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4442889025 + 2037077956 = 66655^2 + 45134^2 .

It is a cyclic number.

It is not a de Polignac number, because 6479966981 - 2¹⁸ = 6479704837 is a prime.

It is a super-2 number, since 2×6479966981² = 83979944149700508722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6479966081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3239983490 + 3239983491.

It is an arithmetic number, because the mean of its divisors is an integer number (3239983491).

Almost surely, 2^6479966981 is an apocalyptic number.

It is an amenable number.

6479966981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6479966981 is an equidigital number, since it uses as much as digits as its factorization.

6479966981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35271936, while the sum is 65.

The square root of 6479966981 is about 80498.2420988185. The cubic root of 6479966981 is about 1864.3363369709.

The spelling of 6479966981 in words is "six billion, four hundred seventy-nine million, nine hundred sixty-six thousand, nine hundred eighty-one".