77788652408105 has 4 divisors (see below), whose sum is σ = 93346382889732. Its totient is φ = 62230921926480.

The previous prime is 77788652407997. The next prime is 77788652408119. The reversal of 77788652408105 is 50180425688777.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20617920164416 + 57170732243689 = 4540696^2 + 7561133^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77788652408105 is a prime.

It is a Duffinian number.

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, 7778865240806 + ... + 7778865240815.

It is an arithmetic number, because the mean of its divisors is an integer number (23336595722433).

Almost surely, 2^{77788652408105} is an apocalyptic number.

It is an amenable number.

77788652408105 is a deficient number, since it is larger than the sum of its proper divisors (15557730481627).

77788652408105 is a wasteful number, since it uses less digits than its factorization.

77788652408105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15557730481626.

The product of its (nonzero) digits is 210739200, while the sum is 68.

The spelling of 77788652408105 in words is "seventy-seven trillion, seven hundred eighty-eight billion, six hundred fifty-two million, four hundred eight thousand, one hundred five".