6861800653 has 2 divisors, whose sum is σ = 6861800654. Its totient is φ = 6861800652.

The previous prime is 6861800641. The next prime is 6861800663. The reversal of 6861800653 is 3560081686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4919900164 + 1941900489 = 70142^2 + 44067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6861800653 is a prime.

It is a super-2 number, since 2×6861800653² = 94168616403022452818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6861800623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3430900326 + 3430900327.

It is an arithmetic number, because the mean of its divisors is an integer number (3430900327).

Almost surely, 2^6861800653 is an apocalyptic number.

It is an amenable number.

6861800653 is a deficient number, since it is larger than the sum of its proper divisors (1).

6861800653 is an equidigital number, since it uses as much as digits as its factorization.

6861800653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 6861800653 is about 82835.9864611993. The cubic root of 6861800653 is about 1900.2585661958.

The spelling of 6861800653 in words is "six billion, eight hundred sixty-one million, eight hundred thousand, six hundred fifty-three".