77680028149 has 2 divisors, whose sum is σ = 77680028150. Its totient is φ = 77680028148.

The previous prime is 77680028141. The next prime is 77680028189. The reversal of 77680028149 is 94182008677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72205064100 + 5474964049 = 268710^2 + 73993^2 .

It is an emirp because it is prime and its reverse (94182008677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77680028149 - 2³ = 77680028141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77680028096 and 77680028105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77680028141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38840014074 + 38840014075.

It is an arithmetic number, because the mean of its divisors is an integer number (38840014075).

Almost surely, 2^77680028149 is an apocalyptic number.

It is an amenable number.

77680028149 is a deficient number, since it is larger than the sum of its proper divisors (1).

77680028149 is an equidigital number, since it uses as much as digits as its factorization.

77680028149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 77680028149 in words is "seventy-seven billion, six hundred eighty million, twenty-eight thousand, one hundred forty-nine".