2782557780257 has 4 divisors (see below), whose sum is σ = 2817780030720. Its totient is φ = 2747335529796.

The previous prime is 2782557780241. The next prime is 2782557780271. The reversal of 2782557780257 is 7520877552872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2782557780257 - 2⁴ = 2782557780241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2782557780193 and 2782557780202.

It is not an unprimeable number, because it can be changed into a prime (2782557750257) 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, 17611125113 + ... + 17611125270.

It is an arithmetic number, because the mean of its divisors is an integer number (704445007680).

Almost surely, 2^{2782557780257} is an apocalyptic number.

It is an amenable number.

2782557780257 is a deficient number, since it is larger than the sum of its proper divisors (35222250463).

2782557780257 is an equidigital number, since it uses as much as digits as its factorization.

2782557780257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35222250462.

The product of its (nonzero) digits is 153664000, while the sum is 65.

The spelling of 2782557780257 in words is "two trillion, seven hundred eighty-two billion, five hundred fifty-seven million, seven hundred eighty thousand, two hundred fifty-seven".