77745171892 has 6 divisors (see below), whose sum is σ = 136054050818. Its totient is φ = 38872585944.

The previous prime is 77745171883. The next prime is 77745171893. The reversal of 77745171892 is 29817154777.

It can be written as a sum of positive squares in only one way, i.e., 39012570256 + 38732601636 = 197516^2 + 196806^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 9718146483 + ... + 9718146490.

Almost surely, 2^77745171892 is an apocalyptic number.

It is an amenable number.

77745171892 is a deficient number, since it is larger than the sum of its proper divisors (58308878926).

77745171892 is a wasteful number, since it uses less digits than its factorization.

77745171892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19436292977 (or 19436292975 counting only the distinct ones).

The product of its digits is 6914880, while the sum is 58.

The spelling of 77745171892 in words is "seventy-seven billion, seven hundred forty-five million, one hundred seventy-one thousand, eight hundred ninety-two".