2778285551 has 4 divisors (see below), whose sum is σ = 2778796104. Its totient is φ = 2777775000.

The previous prime is 2778285541. The next prime is 2778285553. The reversal of 2778285551 is 1555828772.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2778285551 - 2²⁶ = 2711176687 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 2778285551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2778285553) 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, 247025 + ... + 258026.

It is an arithmetic number, because the mean of its divisors is an integer number (694699026).

Almost surely, 2^2778285551 is an apocalyptic number.

2778285551 is a deficient number, since it is larger than the sum of its proper divisors (510553).

2778285551 is an equidigital number, since it uses as much as digits as its factorization.

2778285551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510552.

The product of its digits is 1568000, while the sum is 50.

The square root of 2778285551 is about 52709.4446091021. Note that the first 3 decimals coincide. The cubic root of 2778285551 is about 1405.8067581220.

It can be divided in two parts, 277 and 8285551, that added together give a palindrome (8285828).

The spelling of 2778285551 in words is "two billion, seven hundred seventy-eight million, two hundred eighty-five thousand, five hundred fifty-one".