6424129861 has 2 divisors, whose sum is σ = 6424129862. Its totient is φ = 6424129860.

The previous prime is 6424129849. The next prime is 6424129897. The reversal of 6424129861 is 1689214246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6031852225 + 392277636 = 77665^2 + 19806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6424129861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6494129861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3212064930 + 3212064931.

It is an arithmetic number, because the mean of its divisors is an integer number (3212064931).

Almost surely, 2^6424129861 is an apocalyptic number.

It is an amenable number.

6424129861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6424129861 is an equidigital number, since it uses as much as digits as its factorization.

6424129861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 6424129861 is about 80150.6697476696. The cubic root of 6424129861 is about 1858.9659590456.

The spelling of 6424129861 in words is "six billion, four hundred twenty-four million, one hundred twenty-nine thousand, eight hundred sixty-one".