1785851796997 has 2 divisors, whose sum is σ = 1785851796998. Its totient is φ = 1785851796996.

The previous prime is 1785851796959. The next prime is 1785851797003. The reversal of 1785851796997 is 7996971585871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1488609847396 + 297241949601 = 1220086^2 + 545199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1785851796997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1785851796997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1785851776997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 892925898498 + 892925898499.

It is an arithmetic number, because the mean of its divisors is an integer number (892925898499).

Almost surely, 2^{1785851796997} is an apocalyptic number.

It is an amenable number.

1785851796997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1785851796997 is an equidigital number, since it uses as much as digits as its factorization.

1785851796997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400451200, while the sum is 82.

The spelling of 1785851796997 in words is "one trillion, seven hundred eighty-five billion, eight hundred fifty-one million, seven hundred ninety-six thousand, nine hundred ninety-seven".