780872668901 has 4 divisors (see below), whose sum is σ = 840939797292. Its totient is φ = 720805540512.

The previous prime is 780872668897. The next prime is 780872668909. The reversal of 780872668901 is 109866278087.

It is a Cunningham number, because it is equal to 883670²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 109866278087 = 2113 ⋅51995399.

It can be written as a sum of positive squares in 2 ways, for example, as 115514335876 + 665358333025 = 339874^2 + 815695^2 .

It is a cyclic number.

It is not a de Polignac number, because 780872668901 - 2² = 780872668897 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780872668909) 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, 30033564176 + ... + 30033564201.

It is an arithmetic number, because the mean of its divisors is an integer number (210234949323).

Almost surely, 2^780872668901 is an apocalyptic number.

It is an amenable number.

780872668901 is a deficient number, since it is larger than the sum of its proper divisors (60067128391).

780872668901 is a wasteful number, since it uses less digits than its factorization.

780872668901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60067128390.

The product of its (nonzero) digits is 16257024, while the sum is 62.

The spelling of 780872668901 in words is "seven hundred eighty billion, eight hundred seventy-two million, six hundred sixty-eight thousand, nine hundred one".