2778356653 has 2 divisors, whose sum is σ = 2778356654. Its totient is φ = 2778356652.

The previous prime is 2778356611. The next prime is 2778356657. The reversal of 2778356653 is 3566538772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1864685124 + 913671529 = 43182^2 + 30227^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2778356653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2778356653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778356657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389178326 + 1389178327.

It is an arithmetic number, because the mean of its divisors is an integer number (1389178327).

Almost surely, 2^2778356653 is an apocalyptic number.

It is an amenable number.

2778356653 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778356653 is an equidigital number, since it uses as much as digits as its factorization.

2778356653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6350400, while the sum is 52.

The square root of 2778356653 is about 52710.1190759421. The cubic root of 2778356653 is about 1405.8187505082.

The spelling of 2778356653 in words is "two billion, seven hundred seventy-eight million, three hundred fifty-six thousand, six hundred fifty-three".