2145648077 has 2 divisors, whose sum is σ = 2145648078. Its totient is φ = 2145648076.

The previous prime is 2145648067. The next prime is 2145648091. The reversal of 2145648077 is 7708465412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1356375241 + 789272836 = 36829^2 + 28094^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145648077 - 2²⁸ = 1877212621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145648067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072824038 + 1072824039.

It is an arithmetic number, because the mean of its divisors is an integer number (1072824039).

Almost surely, 2^2145648077 is an apocalyptic number.

It is an amenable number.

2145648077 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145648077 is an equidigital number, since it uses as much as digits as its factorization.

2145648077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 376320, while the sum is 44.

The square root of 2145648077 is about 46321.1407135014. The cubic root of 2145648077 is about 1289.7914605909.

The spelling of 2145648077 in words is "two billion, one hundred forty-five million, six hundred forty-eight thousand, seventy-seven".