77728486768651 has 4 divisors (see below), whose sum is σ = 77928302930400. Its totient is φ = 77528670606904.

The previous prime is 77728486768601. The next prime is 77728486768687. The reversal of 77728486768651 is 15686768482777.

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

It is a cyclic number.

It is not a de Polignac number, because 77728486768651 - 2¹³ = 77728486760459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77728486768601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99908080291 + ... + 99908081068.

It is an arithmetic number, because the mean of its divisors is an integer number (19482075732600).

Almost surely, 2^{77728486768651} is an apocalyptic number.

77728486768651 is a deficient number, since it is larger than the sum of its proper divisors (199816161749).

77728486768651 is a wasteful number, since it uses less digits than its factorization.

77728486768651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199816161748.

The product of its digits is 10621255680, while the sum is 82.

The spelling of 77728486768651 in words is "seventy-seven trillion, seven hundred twenty-eight billion, four hundred eighty-six million, seven hundred sixty-eight thousand, six hundred fifty-one".