2778566773 has 4 divisors (see below), whose sum is σ = 2899374048. Its totient is φ = 2657759500.

The previous prime is 2778566743. The next prime is 2778566789. The reversal of 2778566773 is 3776658772.

2778566773 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2778566773 - 2²¹ = 2776469621 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 (2778566743) 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, 60403603 + ... + 60403648.

It is an arithmetic number, because the mean of its divisors is an integer number (724843512).

Almost surely, 2^2778566773 is an apocalyptic number.

2778566773 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2778566773 is a deficient number, since it is larger than the sum of its proper divisors (120807275).

2778566773 is a wasteful number, since it uses less digits than its factorization.

2778566773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120807274.

The product of its digits is 20744640, while the sum is 58.

The square root of 2778566773 is about 52712.1122039328. The cubic root of 2778566773 is about 1405.8541891057.

The spelling of 2778566773 in words is "two billion, seven hundred seventy-eight million, five hundred sixty-six thousand, seven hundred seventy-three".