77358954961 has 4 divisors (see below), whose sum is σ = 77404542372. Its totient is φ = 77313367552.

The previous prime is 77358954923. The next prime is 77358954977. The reversal of 77358954961 is 16945985377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16945985377 = 131 ⋅129358667.

It can be written as a sum of positive squares in 2 ways, for example, as 72620009361 + 4738945600 = 269481^2 + 68840^2 .

It is a cyclic number.

It is not a de Polignac number, because 77358954961 - 2⁷ = 77358954833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77358954893 and 77358954902.

It is not an unprimeable number, because it can be changed into a prime (77358951961) 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 in 3 ways as a sum of consecutive naturals, for example, 22791160 + ... + 22794553.

It is an arithmetic number, because the mean of its divisors is an integer number (19351135593).

Almost surely, 2^77358954961 is an apocalyptic number.

It is an amenable number.

77358954961 is a deficient number, since it is larger than the sum of its proper divisors (45587411).

77358954961 is a wasteful number, since it uses less digits than its factorization.

77358954961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45587410.

The product of its digits is 57153600, while the sum is 64.

The spelling of 77358954961 in words is "seventy-seven billion, three hundred fifty-eight million, nine hundred fifty-four thousand, nine hundred sixty-one".