1655085508789 has 2 divisors, whose sum is σ = 1655085508790. Its totient is φ = 1655085508788.

The previous prime is 1655085508757. The next prime is 1655085508831. The reversal of 1655085508789 is 9878055805561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1645147412689 + 9938096100 = 1282633^2 + 99690^2 .

It is an emirp because it is prime and its reverse (9878055805561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1655085508789 - 2⁵ = 1655085508757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1655085508889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827542754394 + 827542754395.

It is an arithmetic number, because the mean of its divisors is an integer number (827542754395).

Almost surely, 2^{1655085508789} is an apocalyptic number.

It is an amenable number.

1655085508789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655085508789 is an equidigital number, since it uses as much as digits as its factorization.

1655085508789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960000, while the sum is 67.

The spelling of 1655085508789 in words is "one trillion, six hundred fifty-five billion, eighty-five million, five hundred eight thousand, seven hundred eighty-nine".