6343764355681 has 2 divisors, whose sum is σ = 6343764355682. Its totient is φ = 6343764355680.

The previous prime is 6343764355651. The next prime is 6343764355697. The reversal of 6343764355681 is 1865534673436.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5357447227456 + 986317128225 = 2314616^2 + 993135^2 .

It is a cyclic number.

It is not a de Polignac number, because 6343764355681 - 2⁷ = 6343764355553 is a prime.

It is a super-2 number, since 2×6343764355681² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6343764355631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3171882177840 + 3171882177841.

It is an arithmetic number, because the mean of its divisors is an integer number (3171882177841).

Almost surely, 2^{6343764355681} is an apocalyptic number.

It is an amenable number.

6343764355681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6343764355681 is an equidigital number, since it uses as much as digits as its factorization.

6343764355681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 130636800, while the sum is 61.

The spelling of 6343764355681 in words is "six trillion, three hundred forty-three billion, seven hundred sixty-four million, three hundred fifty-five thousand, six hundred eighty-one".