493715637721 has 2 divisors, whose sum is σ = 493715637722. Its totient is φ = 493715637720.

The previous prime is 493715637703. The next prime is 493715637847. The reversal of 493715637721 is 127736517394.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273063728025 + 220651909696 = 522555^2 + 469736^2 .

It is a cyclic number.

It is not a de Polignac number, because 493715637721 - 2¹³ = 493715629529 is a prime.

It is not a weakly prime, because it can be changed into another prime (493715637421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246857818860 + 246857818861.

It is an arithmetic number, because the mean of its divisors is an integer number (246857818861).

Almost surely, 2^493715637721 is an apocalyptic number.

It is an amenable number.

493715637721 is a deficient number, since it is larger than the sum of its proper divisors (1).

493715637721 is an equidigital number, since it uses as much as digits as its factorization.

493715637721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6667920, while the sum is 55.

The spelling of 493715637721 in words is "four hundred ninety-three billion, seven hundred fifteen million, six hundred thirty-seven thousand, seven hundred twenty-one".