2636778541 has 2 divisors, whose sum is σ = 2636778542. Its totient is φ = 2636778540.

The previous prime is 2636778527. The next prime is 2636778559. The reversal of 2636778541 is 1458776362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2368768900 + 268009641 = 48670^2 + 16371^2 .

It is a cyclic number.

It is not a de Polignac number, because 2636778541 - 2⁵ = 2636778509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2636758541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1318389270 + 1318389271.

It is an arithmetic number, because the mean of its divisors is an integer number (1318389271).

Almost surely, 2^2636778541 is an apocalyptic number.

It is an amenable number.

2636778541 is a deficient number, since it is larger than the sum of its proper divisors (1).

2636778541 is an equidigital number, since it uses as much as digits as its factorization.

2636778541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 49.

The square root of 2636778541 is about 51349.5719651099. The cubic root of 2636778541 is about 1381.5222544322.

The spelling of 2636778541 in words is "two billion, six hundred thirty-six million, seven hundred seventy-eight thousand, five hundred forty-one".