77443440413 has 2 divisors, whose sum is σ = 77443440414. Its totient is φ = 77443440412.

The previous prime is 77443440401. The next prime is 77443440433. The reversal of 77443440413 is 31404434477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58913969284 + 18529471129 = 242722^2 + 136123^2 .

It is a cyclic number.

It is not a de Polignac number, because 77443440413 - 2¹⁴ = 77443424029 is a prime.

It is a super-2 number, since 2×77443440413² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77443440433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38721720206 + 38721720207.

It is an arithmetic number, because the mean of its divisors is an integer number (38721720207).

Almost surely, 2^77443440413 is an apocalyptic number.

It is an amenable number.

77443440413 is a deficient number, since it is larger than the sum of its proper divisors (1).

77443440413 is an equidigital number, since it uses as much as digits as its factorization.

77443440413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 41.

The spelling of 77443440413 in words is "seventy-seven billion, four hundred forty-three million, four hundred forty thousand, four hundred thirteen".