6343518153421 has 2 divisors, whose sum is σ = 6343518153422. Its totient is φ = 6343518153420.

The previous prime is 6343518153353. The next prime is 6343518153457. The reversal of 6343518153421 is 1243518153436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5130854689321 + 1212663464100 = 2265139^2 + 1101210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6343518153421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6343518103421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3171759076710 + 3171759076711.

It is an arithmetic number, because the mean of its divisors is an integer number (3171759076711).

Almost surely, 2^{6343518153421} is an apocalyptic number.

It is an amenable number.

6343518153421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6343518153421 is an equidigital number, since it uses as much as digits as its factorization.

6343518153421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 46.

The spelling of 6343518153421 in words is "six trillion, three hundred forty-three billion, five hundred eighteen million, one hundred fifty-three thousand, four hundred twenty-one".