4611785441581 has 2 divisors, whose sum is σ = 4611785441582. Its totient is φ = 4611785441580.

The previous prime is 4611785441551. The next prime is 4611785441687. The reversal of 4611785441581 is 1851445871164.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2774922956100 + 1836862485481 = 1665810^2 + 1355309^2 .

It is a cyclic number.

It is not a de Polignac number, because 4611785441581 - 2¹⁹ = 4611784917293 is a prime.

It is a super-2 number, since 2×4611785441581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4611785441521) 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, 2305892720790 + 2305892720791.

It is an arithmetic number, because the mean of its divisors is an integer number (2305892720791).

Almost surely, 2^{4611785441581} is an apocalyptic number.

It is an amenable number.

4611785441581 is a deficient number, since it is larger than the sum of its proper divisors (1).

4611785441581 is an equidigital number, since it uses as much as digits as its factorization.

4611785441581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4300800, while the sum is 55.

The spelling of 4611785441581 in words is "four trillion, six hundred eleven billion, seven hundred eighty-five million, four hundred forty-one thousand, five hundred eighty-one".