6245661281 has 2 divisors, whose sum is σ = 6245661282. Its totient is φ = 6245661280.

The previous prime is 6245661221. The next prime is 6245661283. The reversal of 6245661281 is 1821665426.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6241000000 + 4661281 = 79000^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 6245661281 - 2⁶ = 6245661217 is a prime.

It is a super-2 number, since 2×6245661281² = 78016569673965121922, which contains 22 as substring.

Together with 6245661283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6245661283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3122830640 + 3122830641.

It is an arithmetic number, because the mean of its divisors is an integer number (3122830641).

Almost surely, 2^6245661281 is an apocalyptic number.

It is an amenable number.

6245661281 is a deficient number, since it is larger than the sum of its proper divisors (1).

6245661281 is an equidigital number, since it uses as much as digits as its factorization.

6245661281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The square root of 6245661281 is about 79029.4962719616. The cubic root of 6245661281 is about 1841.5894112521.

The spelling of 6245661281 in words is "six billion, two hundred forty-five million, six hundred sixty-one thousand, two hundred eighty-one".