77667966443 has 2 divisors, whose sum is σ = 77667966444. Its totient is φ = 77667966442.

The previous prime is 77667966367. The next prime is 77667966529. The reversal of 77667966443 is 34466976677.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77667966443 - 2³⁴ = 60488097259 is a prime.

It is a super-2 number, since 2×77667966443² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77667966443.

It is not a weakly prime, because it can be changed into another prime (77667966143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38833983221 + 38833983222.

It is an arithmetic number, because the mean of its divisors is an integer number (38833983222).

Almost surely, 2^77667966443 is an apocalyptic number.

77667966443 is a deficient number, since it is larger than the sum of its proper divisors (1).

77667966443 is an equidigital number, since it uses as much as digits as its factorization.

77667966443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192036096, while the sum is 65.

The spelling of 77667966443 in words is "seventy-seven billion, six hundred sixty-seven million, nine hundred sixty-six thousand, four hundred forty-three".