43774866664261 has 2 divisors, whose sum is σ = 43774866664262. Its totient is φ = 43774866664260.

The previous prime is 43774866664253. The next prime is 43774866664339. The reversal of 43774866664261 is 16246666847734.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31614867744100 + 12159998920161 = 5622710^2 + 3487119^2 .

It is a cyclic number.

It is not a de Polignac number, because 43774866664261 - 2³ = 43774866664253 is a prime.

It is a super-2 number, since 2×43774866664261² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43774866664201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21887433332130 + 21887433332131.

It is an arithmetic number, because the mean of its divisors is an integer number (21887433332131).

Almost surely, 2^{43774866664261} is an apocalyptic number.

It is an amenable number.

43774866664261 is a deficient number, since it is larger than the sum of its proper divisors (1).

43774866664261 is an equidigital number, since it uses as much as digits as its factorization.

43774866664261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1170505728, while the sum is 70.

The spelling of 43774866664261 in words is "forty-three trillion, seven hundred seventy-four billion, eight hundred sixty-six million, six hundred sixty-four thousand, two hundred sixty-one".