77999099977 has 4 divisors (see below), whose sum is σ = 78027852820. Its totient is φ = 77970347136.

The previous prime is 77999099963. The next prime is 77999099999.

77999099977 is nontrivially palindromic in base 10.

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 43082814096 + 34916285881 = 207564^2 + 186859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77999099977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77999099977.

It is not an unprimeable number, because it can be changed into a prime (77999099917) 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, 14372352 + ... + 14377777.

It is an arithmetic number, because the mean of its divisors is an integer number (19506963205).

Almost surely, 2^77999099977 is an apocalyptic number.

It is an amenable number.

77999099977 is a deficient number, since it is larger than the sum of its proper divisors (28752843).

77999099977 is a wasteful number, since it uses less digits than its factorization.

77999099977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28752842.

The product of its (nonzero) digits is 1275989841, while the sum is 82.

The spelling of 77999099977 in words is "seventy-seven billion, nine hundred ninety-nine million, ninety-nine thousand, nine hundred seventy-seven".