77166716216449 has 16 divisors (see below), whose sum is σ = 78332132160000. Its totient is φ = 76008005821440.

The previous prime is 77166716216441. The next prime is 77166716216531. The reversal of 77166716216449 is 94461261766177.

It is a cyclic number.

It is not a de Polignac number, because 77166716216449 - 2³ = 77166716216441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77166716216441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184277092 + ... + 184695370.

It is an arithmetic number, because the mean of its divisors is an integer number (4895758260000).

Almost surely, 2^{77166716216449} is an apocalyptic number.

It is an amenable number.

77166716216449 is a deficient number, since it is larger than the sum of its proper divisors (1165415943551).

77166716216449 is a wasteful number, since it uses less digits than its factorization.

77166716216449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426288.

The product of its digits is 128024064, while the sum is 67.

The spelling of 77166716216449 in words is "seventy-seven trillion, one hundred sixty-six billion, seven hundred sixteen million, two hundred sixteen thousand, four hundred forty-nine".