77044531189 has 2 divisors, whose sum is σ = 77044531190. Its totient is φ = 77044531188.

The previous prime is 77044531163. The next prime is 77044531211. The reversal of 77044531189 is 98113544077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62247755025 + 14796776164 = 249495^2 + 121642^2 .

It is an emirp because it is prime and its reverse (98113544077) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77044531189 - 2¹⁷ = 77044400117 is a prime.

It is a super-2 number, since 2×77044531189² (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 (77044531139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38522265594 + 38522265595.

It is an arithmetic number, because the mean of its divisors is an integer number (38522265595).

Almost surely, 2^77044531189 is an apocalyptic number.

It is an amenable number.

77044531189 is a deficient number, since it is larger than the sum of its proper divisors (1).

77044531189 is an equidigital number, since it uses as much as digits as its factorization.

77044531189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 77044531189 in words is "seventy-seven billion, forty-four million, five hundred thirty-one thousand, one hundred eighty-nine".