1285645721707 has 2 divisors, whose sum is σ = 1285645721708. Its totient is φ = 1285645721706.

The previous prime is 1285645721669. The next prime is 1285645721713. The reversal of 1285645721707 is 7071275465821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1285645721707 - 2¹⁵ = 1285645688939 is a prime.

It is not a weakly prime, because it can be changed into another prime (1285645761707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642822860853 + 642822860854.

It is an arithmetic number, because the mean of its divisors is an integer number (642822860854).

Almost surely, 2^{1285645721707} is an apocalyptic number.

1285645721707 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285645721707 is an equidigital number, since it uses as much as digits as its factorization.

1285645721707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6585600, while the sum is 55.

The spelling of 1285645721707 in words is "one trillion, two hundred eighty-five billion, six hundred forty-five million, seven hundred twenty-one thousand, seven hundred seven".