5640637481 has 2 divisors, whose sum is σ = 5640637482. Its totient is φ = 5640637480.

The previous prime is 5640637463. The next prime is 5640637517. The reversal of 5640637481 is 1847360465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5521827481 + 118810000 = 74309^2 + 10900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5640637481 is a prime.

It is a super-2 number, since 2×5640637481² = 63633582384124050722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5640637411) 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, 2820318740 + 2820318741.

It is an arithmetic number, because the mean of its divisors is an integer number (2820318741).

Almost surely, 2^5640637481 is an apocalyptic number.

It is an amenable number.

5640637481 is a deficient number, since it is larger than the sum of its proper divisors (1).

5640637481 is an equidigital number, since it uses as much as digits as its factorization.

5640637481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 5640637481 is about 75104.1775202951. The cubic root of 5640637481 is about 1780.0931526598.

The spelling of 5640637481 in words is "five billion, six hundred forty million, six hundred thirty-seven thousand, four hundred eighty-one".