77766513348746 has 4 divisors (see below), whose sum is σ = 116649770023122. Its totient is φ = 38883256674372.

The previous prime is 77766513348731. The next prime is 77766513348751. The reversal of 77766513348746 is 64784331566777.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 44936764773121 + 32829748575625 = 6703489^2 + 5729725^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19441628337185 + ... + 19441628337188.

Almost surely, 2^{77766513348746} is an apocalyptic number.

77766513348746 is a deficient number, since it is larger than the sum of its proper divisors (38883256674376).

77766513348746 is a wasteful number, since it uses less digits than its factorization.

77766513348746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38883256674375.

The product of its digits is 2987228160, while the sum is 74.

The spelling of 77766513348746 in words is "seventy-seven trillion, seven hundred sixty-six billion, five hundred thirteen million, three hundred forty-eight thousand, seven hundred forty-six".