676722959981 has 2 divisors, whose sum is σ = 676722959982. Its totient is φ = 676722959980.

The previous prime is 676722959977. The next prime is 676722959999. The reversal of 676722959981 is 189959227676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 435951190756 + 240771769225 = 660266^2 + 490685^2 .

It is a cyclic number.

It is not a de Polignac number, because 676722959981 - 2² = 676722959977 is a prime.

It is a super-2 number, since 2×676722959981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (676722959921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338361479990 + 338361479991.

It is an arithmetic number, because the mean of its divisors is an integer number (338361479991).

Almost surely, 2^676722959981 is an apocalyptic number.

It is an amenable number.

676722959981 is a deficient number, since it is larger than the sum of its proper divisors (1).

676722959981 is an equidigital number, since it uses as much as digits as its factorization.

676722959981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 205752960, while the sum is 71.

The spelling of 676722959981 in words is "six hundred seventy-six billion, seven hundred twenty-two million, nine hundred fifty-nine thousand, nine hundred eighty-one".