1804464867781 has 2 divisors, whose sum is σ = 1804464867782. Its totient is φ = 1804464867780.

The previous prime is 1804464867731. The next prime is 1804464867847. The reversal of 1804464867781 is 1877684644081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1739059362756 + 65405505025 = 1318734^2 + 255745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1804464867781 - 2¹⁷ = 1804464736709 is a prime.

It is a super-2 number, since 2×1804464867781² (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 (1804464867721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902232433890 + 902232433891.

It is an arithmetic number, because the mean of its divisors is an integer number (902232433891).

Almost surely, 2^{1804464867781} is an apocalyptic number.

It is an amenable number.

1804464867781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804464867781 is an equidigital number, since it uses as much as digits as its factorization.

1804464867781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57802752, while the sum is 64.

The spelling of 1804464867781 in words is "one trillion, eight hundred four billion, four hundred sixty-four million, eight hundred sixty-seven thousand, seven hundred eighty-one".