77722517645 has 12 divisors (see below), whose sum is σ = 95855887764. Its totient is φ = 60497521920.

The previous prime is 77722517629. The next prime is 77722517647. The reversal of 77722517645 is 54671522777.

It can be written as a sum of positive squares in 6 ways, for example, as 4941808804 + 72780708841 = 70298^2 + 269779^2 .

It is not a de Polignac number, because 77722517645 - 2⁴ = 77722517629 is a prime.

It is a super-3 number, since 3×77722517645³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77722517647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5670476 + ... + 5684165.

It is an arithmetic number, because the mean of its divisors is an integer number (7987990647).

Almost surely, 2^77722517645 is an apocalyptic number.

It is an amenable number.

77722517645 is a deficient number, since it is larger than the sum of its proper divisors (18133370119).

77722517645 is a wasteful number, since it uses less digits than its factorization.

77722517645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11354720 (or 11354683 counting only the distinct ones).

The product of its digits is 5762400, while the sum is 53.

The spelling of 77722517645 in words is "seventy-seven billion, seven hundred twenty-two million, five hundred seventeen thousand, six hundred forty-five".