64866782261 has 2 divisors, whose sum is σ = 64866782262. Its totient is φ = 64866782260.

The previous prime is 64866782209. The next prime is 64866782291. The reversal of 64866782261 is 16228766846.

64866782261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37676751025 + 27190031236 = 194105^2 + 164894^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64866782261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64866782197 and 64866782206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64866782291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32433391130 + 32433391131.

It is an arithmetic number, because the mean of its divisors is an integer number (32433391131).

Almost surely, 2^64866782261 is an apocalyptic number.

It is an amenable number.

64866782261 is a deficient number, since it is larger than the sum of its proper divisors (1).

64866782261 is an equidigital number, since it uses as much as digits as its factorization.

64866782261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 56.

The spelling of 64866782261 in words is "sixty-four billion, eight hundred sixty-six million, seven hundred eighty-two thousand, two hundred sixty-one".