1780578245851 has 2 divisors, whose sum is σ = 1780578245852. Its totient is φ = 1780578245850.

The previous prime is 1780578245839. The next prime is 1780578245921. The reversal of 1780578245851 is 1585428750871.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1780578245851 - 2²¹ = 1780576148699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1780578245851.

It is not a weakly prime, because it can be changed into another prime (1780578245351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890289122925 + 890289122926.

It is an arithmetic number, because the mean of its divisors is an integer number (890289122926).

Almost surely, 2^{1780578245851} is an apocalyptic number.

1780578245851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780578245851 is an equidigital number, since it uses as much as digits as its factorization.

1780578245851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088000, while the sum is 61.

The spelling of 1780578245851 in words is "one trillion, seven hundred eighty billion, five hundred seventy-eight million, two hundred forty-five thousand, eight hundred fifty-one".