77786128808644 has 12 divisors (see below), whose sum is σ = 136126140950800. Its totient is φ = 38892945679848.

The previous prime is 77786128808627. The next prime is 77786128808693. The reversal of 77786128808644 is 44680882168777.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28198734 + ... + 30834085.

Almost surely, 2^{77786128808644} is an apocalyptic number.

It is an amenable number.

77786128808644 is a deficient number, since it is larger than the sum of its proper divisors (58340012142156).

77786128808644 is a wasteful number, since it uses less digits than its factorization.

77786128808644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59362242 (or 59362240 counting only the distinct ones).

The product of its (nonzero) digits is 1618477056, while the sum is 76.

The spelling of 77786128808644 in words is "seventy-seven trillion, seven hundred eighty-six billion, one hundred twenty-eight million, eight hundred eight thousand, six hundred forty-four".