1655105894581 has 2 divisors, whose sum is σ = 1655105894582. Its totient is φ = 1655105894580.

The previous prime is 1655105894543. The next prime is 1655105894591. The reversal of 1655105894581 is 1854985015561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1071982753956 + 583123140625 = 1035366^2 + 763625^2 .

It is an emirp because it is prime and its reverse (1854985015561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1655105894581 - 2¹³ = 1655105886389 is a prime.

It is a super-2 number, since 2×1655105894581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1655105894591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827552947290 + 827552947291.

It is an arithmetic number, because the mean of its divisors is an integer number (827552947291).

Almost surely, 2^{1655105894581} is an apocalyptic number.

It is an amenable number.

1655105894581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655105894581 is an equidigital number, since it uses as much as digits as its factorization.

1655105894581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640000, while the sum is 58.

The spelling of 1655105894581 in words is "one trillion, six hundred fifty-five billion, one hundred five million, eight hundred ninety-four thousand, five hundred eighty-one".