7622779981 has 2 divisors, whose sum is σ = 7622779982. Its totient is φ = 7622779980.

The previous prime is 7622779943. The next prime is 7622780041. The reversal of 7622779981 is 1899772267.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7351519081 + 271260900 = 85741^2 + 16470^2 .

It is a cyclic number.

It is not a de Polignac number, because 7622779981 - 2⁹ = 7622779469 is a prime.

It is a super-2 number, since 2×7622779981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7622779921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3811389990 + 3811389991.

It is an arithmetic number, because the mean of its divisors is an integer number (3811389991).

Almost surely, 2^7622779981 is an apocalyptic number.

It is an amenable number.

7622779981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7622779981 is an equidigital number, since it uses as much as digits as its factorization.

7622779981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5334336, while the sum is 58.

The square root of 7622779981 is about 87308.5332656551. The cubic root of 7622779981 is about 1968.0575544624.

The spelling of 7622779981 in words is "seven billion, six hundred twenty-two million, seven hundred seventy-nine thousand, nine hundred eighty-one".