6344669899861 has 2 divisors, whose sum is σ = 6344669899862. Its totient is φ = 6344669899860.

The previous prime is 6344669899859. The next prime is 6344669899877. The reversal of 6344669899861 is 1689989664436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5478478578225 + 866191321636 = 2340615^2 + 930694^2 .

It is a cyclic number.

It is not a de Polignac number, because 6344669899861 - 2¹ = 6344669899859 is a prime.

It is a super-2 number, since 2×6344669899861² (a number of 26 digits) contains 22 as substring.

Together with 6344669899859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6344669899811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3172334949930 + 3172334949931.

It is an arithmetic number, because the mean of its divisors is an integer number (3172334949931).

Almost surely, 2^{6344669899861} is an apocalyptic number.

It is an amenable number.

6344669899861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6344669899861 is an equidigital number, since it uses as much as digits as its factorization.

6344669899861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2902376448, while the sum is 79.

The spelling of 6344669899861 in words is "six trillion, three hundred forty-four billion, six hundred sixty-nine million, eight hundred ninety-nine thousand, eight hundred sixty-one".