6401356369 has 2 divisors, whose sum is σ = 6401356370. Its totient is φ = 6401356368.

The previous prime is 6401356361. The next prime is 6401356391. The reversal of 6401356369 is 9636531046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5100816400 + 1300539969 = 71420^2 + 36063^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401356369 - 2³ = 6401356361 is a prime.

It is a super-2 number, since 2×6401356369² = 81954726725873728322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6401356361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200678184 + 3200678185.

It is an arithmetic number, because the mean of its divisors is an integer number (3200678185).

Almost surely, 2^6401356369 is an apocalyptic number.

It is an amenable number.

6401356369 is a deficient number, since it is larger than the sum of its proper divisors (1).

6401356369 is an equidigital number, since it uses as much as digits as its factorization.

6401356369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 43.

The square root of 6401356369 is about 80008.4768571431. The cubic root of 6401356369 is about 1856.7666847472.

The spelling of 6401356369 in words is "six billion, four hundred one million, three hundred fifty-six thousand, three hundred sixty-nine".