5646612581 has 2 divisors, whose sum is σ = 5646612582. Its totient is φ = 5646612580.

The previous prime is 5646612557. The next prime is 5646612593. The reversal of 5646612581 is 1852166465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3089692225 + 2556920356 = 55585^2 + 50566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5646612581 is a prime.

It is a super-2 number, since 2×5646612581² = 63768467279814963122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5646612511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2823306290 + 2823306291.

It is an arithmetic number, because the mean of its divisors is an integer number (2823306291).

Almost surely, 2^5646612581 is an apocalyptic number.

It is an amenable number.

5646612581 is a deficient number, since it is larger than the sum of its proper divisors (1).

5646612581 is an equidigital number, since it uses as much as digits as its factorization.

5646612581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 44.

The square root of 5646612581 is about 75143.9457374977. The cubic root of 5646612581 is about 1780.7214788731.

The spelling of 5646612581 in words is "five billion, six hundred forty-six million, six hundred twelve thousand, five hundred eighty-one".