6436430261 has 2 divisors, whose sum is σ = 6436430262. Its totient is φ = 6436430260.

The previous prime is 6436430257. The next prime is 6436430263. The reversal of 6436430261 is 1620346346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4701707761 + 1734722500 = 68569^2 + 41650^2 .

It is a cyclic number.

It is not a de Polignac number, because 6436430261 - 2² = 6436430257 is a prime.

Together with 6436430263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6436430263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3218215130 + 3218215131.

It is an arithmetic number, because the mean of its divisors is an integer number (3218215131).

Almost surely, 2^6436430261 is an apocalyptic number.

It is an amenable number.

6436430261 is a deficient number, since it is larger than the sum of its proper divisors (1).

6436430261 is an equidigital number, since it uses as much as digits as its factorization.

6436430261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 35.

The square root of 6436430261 is about 80227.3660355368. The cubic root of 6436430261 is about 1860.1516680771.

The spelling of 6436430261 in words is "six billion, four hundred thirty-six million, four hundred thirty thousand, two hundred sixty-one".