1778900970647 has 2 divisors, whose sum is σ = 1778900970648. Its totient is φ = 1778900970646.

The previous prime is 1778900970611. The next prime is 1778900970659. The reversal of 1778900970647 is 7460790098771.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1778900970647 - 2³⁴ = 1761721101463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1778900970677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889450485323 + 889450485324.

It is an arithmetic number, because the mean of its divisors is an integer number (889450485324).

Almost surely, 2^{1778900970647} is an apocalyptic number.

1778900970647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1778900970647 is an equidigital number, since it uses as much as digits as its factorization.

1778900970647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37340352, while the sum is 65.

The spelling of 1778900970647 in words is "one trillion, seven hundred seventy-eight billion, nine hundred million, nine hundred seventy thousand, six hundred forty-seven".