553617913721 has 2 divisors, whose sum is σ = 553617913722. Its totient is φ = 553617913720.

The previous prime is 553617913669. The next prime is 553617913769. The reversal of 553617913721 is 127319716355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395973181696 + 157644732025 = 629264^2 + 397045^2 .

It is a cyclic number.

It is not a de Polignac number, because 553617913721 - 2⁶ = 553617913657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 553617913721.

It is not a weakly prime, because it can be changed into another prime (553617913621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276808956860 + 276808956861.

It is an arithmetic number, because the mean of its divisors is an integer number (276808956861).

Almost surely, 2^553617913721 is an apocalyptic number.

It is an amenable number.

553617913721 is a deficient number, since it is larger than the sum of its proper divisors (1).

553617913721 is an equidigital number, since it uses as much as digits as its factorization.

553617913721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1190700, while the sum is 50.

The spelling of 553617913721 in words is "five hundred fifty-three billion, six hundred seventeen million, nine hundred thirteen thousand, seven hundred twenty-one".