2775643889 has 2 divisors, whose sum is σ = 2775643890. Its totient is φ = 2775643888.

The previous prime is 2775643847. The next prime is 2775643943. The reversal of 2775643889 is 9883465772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1758544225 + 1017099664 = 41935^2 + 31892^2 .

It is a cyclic number.

It is not a de Polignac number, because 2775643889 - 2²⁴ = 2758866673 is a prime.

It is not a weakly prime, because it can be changed into another prime (2775642889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1387821944 + 1387821945.

It is an arithmetic number, because the mean of its divisors is an integer number (1387821945).

Almost surely, 2^2775643889 is an apocalyptic number.

It is an amenable number.

2775643889 is a deficient number, since it is larger than the sum of its proper divisors (1).

2775643889 is an equidigital number, since it uses as much as digits as its factorization.

2775643889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 59.

The square root of 2775643889 is about 52684.3799337147. The cubic root of 2775643889 is about 1405.3610583237.

The spelling of 2775643889 in words is "two billion, seven hundred seventy-five million, six hundred forty-three thousand, eight hundred eighty-nine".