2067720709 has 2 divisors, whose sum is σ = 2067720710. Its totient is φ = 2067720708.

The previous prime is 2067720653. The next prime is 2067720737. The reversal of 2067720709 is 9070277602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2067520900 + 199809 = 45470^2 + 447^2 .

It is a cyclic number.

It is not a de Polignac number, because 2067720709 - 2¹⁹ = 2067196421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2067720779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1033860354 + 1033860355.

It is an arithmetic number, because the mean of its divisors is an integer number (1033860355).

Almost surely, 2^2067720709 is an apocalyptic number.

It is an amenable number.

2067720709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2067720709 is an equidigital number, since it uses as much as digits as its factorization.

2067720709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 2067720709 is about 45472.1970988867. The cubic root of 2067720709 is about 1273.9839572138.

The spelling of 2067720709 in words is "two billion, sixty-seven million, seven hundred twenty thousand, seven hundred nine".