77207918849 has 2 divisors, whose sum is σ = 77207918850. Its totient is φ = 77207918848.

The previous prime is 77207918839. The next prime is 77207918917. The reversal of 77207918849 is 94881970277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51865507600 + 25342411249 = 227740^2 + 159193^2 .

It is a cyclic number.

It is not a de Polignac number, because 77207918849 - 2²⁸ = 76939483393 is a prime.

It is a super-2 number, since 2×77207918849² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77207918791 and 77207918800.

It is not a weakly prime, because it can be changed into another prime (77207918839) 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, 38603959424 + 38603959425.

It is an arithmetic number, because the mean of its divisors is an integer number (38603959425).

Almost surely, 2^77207918849 is an apocalyptic number.

It is an amenable number.

77207918849 is a deficient number, since it is larger than the sum of its proper divisors (1).

77207918849 is an equidigital number, since it uses as much as digits as its factorization.

77207918849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14224896, while the sum is 62.

The spelling of 77207918849 in words is "seventy-seven billion, two hundred seven million, nine hundred eighteen thousand, eight hundred forty-nine".