77722802109 has 12 divisors (see below), whose sum is σ = 112540764700. Its totient is φ = 51688511424.

The previous prime is 77722802093. The next prime is 77722802119. The reversal of 77722802109 is 90120822777.

It can be written as a sum of positive squares in 2 ways, for example, as 50626350009 + 27096452100 = 225003^2 + 164610^2 .

It is not a de Polignac number, because 77722802109 - 2⁴ = 77722802093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77722802119) 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, 10553614 + ... + 10560975.

Almost surely, 2^77722802109 is an apocalyptic number.

It is an amenable number.

77722802109 is a deficient number, since it is larger than the sum of its proper divisors (34817962591).

77722802109 is a wasteful number, since it uses less digits than its factorization.

77722802109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21115004 (or 21115001 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The spelling of 77722802109 in words is "seventy-seven billion, seven hundred twenty-two million, eight hundred two thousand, one hundred nine".