77203980605 has 18 divisors (see below), whose sum is σ = 93176411886. Its totient is φ = 61410780288.

The previous prime is 77203980599. The next prime is 77203980613. The reversal of 77203980605 is 50608930277.

It can be written as a sum of positive squares in 9 ways, for example, as 54345866884 + 22858113721 = 233122^2 + 151189^2 .

It is not a de Polignac number, because 77203980605 - 2⁴ = 77203980589 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 77203980605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 194468267 + ... + 194468663.

It is an arithmetic number, because the mean of its divisors is an integer number (5176467327).

Almost surely, 2^77203980605 is an apocalyptic number.

It is an amenable number.

77203980605 is a deficient number, since it is larger than the sum of its proper divisors (15972431281).

77203980605 is an frugal number, since it uses more digits than its factorization.

77203980605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425 (or 715 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 77203980605 in words is "seventy-seven billion, two hundred three million, nine hundred eighty thousand, six hundred five".