24821641861 has 2 divisors, whose sum is σ = 24821641862. Its totient is φ = 24821641860.

The previous prime is 24821641849. The next prime is 24821641879. The reversal of 24821641861 is 16814612842.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14567041636 + 10254600225 = 120694^2 + 101265^2 .

It is a cyclic number.

It is not a de Polignac number, because 24821641861 - 2¹⁵ = 24821609093 is a prime.

It is a super-3 number, since 3×24821641861³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24821645861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12410820930 + 12410820931.

It is an arithmetic number, because the mean of its divisors is an integer number (12410820931).

Almost surely, 2^24821641861 is an apocalyptic number.

It is an amenable number.

24821641861 is a deficient number, since it is larger than the sum of its proper divisors (1).

24821641861 is an equidigital number, since it uses as much as digits as its factorization.

24821641861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147456, while the sum is 43.

The spelling of 24821641861 in words is "twenty-four billion, eight hundred twenty-one million, six hundred forty-one thousand, eight hundred sixty-one".