2780697502809 has 6 divisors (see below), whose sum is σ = 4016563059626. Its totient is φ = 1853798335200.

The previous prime is 2780697502747. The next prime is 2780697502811. The reversal of 2780697502809 is 9082057960872.

It can be written as a sum of positive squares in only one way, i.e., 2490311237184 + 290386265625 = 1578072^2 + 538875^2 .

It is not a de Polignac number, because 2780697502809 - 2¹⁷ = 2780697371737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2780697502819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154483194592 + ... + 154483194609.

Almost surely, 2^{2780697502809} is an apocalyptic number.

It is an amenable number.

2780697502809 is a deficient number, since it is larger than the sum of its proper divisors (1235865556817).

2780697502809 is a wasteful number, since it uses less digits than its factorization.

2780697502809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308966389207 (or 308966389204 counting only the distinct ones).

The product of its (nonzero) digits is 30481920, while the sum is 63.

The spelling of 2780697502809 in words is "two trillion, seven hundred eighty billion, six hundred ninety-seven million, five hundred two thousand, eight hundred nine".