77745171890 has 16 divisors (see below), whose sum is σ = 140035319640. Its totient is φ = 31077177600.

The previous prime is 77745171883. The next prime is 77745171893. The reversal of 77745171890 is 9817154777.

It can be written as a sum of positive squares in 4 ways, for example, as 45474283009 + 32270888881 = 213247^2 + 179641^2 .

It is not an unprimeable number, because it can be changed into a prime (77745171893) 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 in 7 ways as a sum of consecutive naturals, for example, 2595761 + ... + 2625540.

Almost surely, 2^77745171890 is an apocalyptic number.

77745171890 is a deficient number, since it is larger than the sum of its proper divisors (62290147750).

77745171890 is a wasteful number, since it uses less digits than its factorization.

77745171890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5222797.

The product of its (nonzero) digits is 3457440, while the sum is 56.

The spelling of 77745171890 in words is "seventy-seven billion, seven hundred forty-five million, one hundred seventy-one thousand, eight hundred ninety".