654043005521 has 2 divisors, whose sum is σ = 654043005522. Its totient is φ = 654043005520.

The previous prime is 654043005503. The next prime is 654043005547. The reversal of 654043005521 is 125500340456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595156703296 + 58886302225 = 771464^2 + 242665^2 .

It is a cyclic number.

It is not a de Polignac number, because 654043005521 - 2²⁶ = 653975896657 is a prime.

It is not a weakly prime, because it can be changed into another prime (654045005521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327021502760 + 327021502761.

It is an arithmetic number, because the mean of its divisors is an integer number (327021502761).

Almost surely, 2^654043005521 is an apocalyptic number.

It is an amenable number.

654043005521 is a deficient number, since it is larger than the sum of its proper divisors (1).

654043005521 is an equidigital number, since it uses as much as digits as its factorization.

654043005521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 654043005521 its reverse (125500340456), we get a palindrome (779543345977).

The spelling of 654043005521 in words is "six hundred fifty-four billion, forty-three million, five thousand, five hundred twenty-one".