77997697767 has 32 divisors (see below), whose sum is σ = 126753419520. Its totient is φ = 47010132000.

The previous prime is 77997697751. The next prime is 77997697787. The reversal of 77997697767 is 76779679977.

It is not a de Polignac number, because 77997697767 - 2⁴ = 77997697751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77997697717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 671709 + ... + 779222.

It is an arithmetic number, because the mean of its divisors is an integer number (3961044360).

Almost surely, 2^77997697767 is an apocalyptic number.

77997697767 is a deficient number, since it is larger than the sum of its proper divisors (48755721753).

77997697767 is a wasteful number, since it uses less digits than its factorization.

77997697767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451132 (or 1451126 counting only the distinct ones).

The product of its digits is 3087580356, while the sum is 81.

The spelling of 77997697767 in words is "seventy-seven billion, nine hundred ninety-seven million, six hundred ninety-seven thousand, seven hundred sixty-seven".