654186194426221 has 2 divisors, whose sum is σ = 654186194426222. Its totient is φ = 654186194426220.

The previous prime is 654186194426173. The next prime is 654186194426287. The reversal of 654186194426221 is 122624491681456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 612964208836996 + 41221985589225 = 24758114^2 + 6420435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654186194426221 is a prime.

It is a super-2 number, since 2×654186194426221² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 654186194426221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654186194426621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327093097213110 + 327093097213111.

It is an arithmetic number, because the mean of its divisors is an integer number (327093097213111).

Almost surely, 2^{654186194426221} is an apocalyptic number.

It is an amenable number.

654186194426221 is a deficient number, since it is larger than the sum of its proper divisors (1).

654186194426221 is an equidigital number, since it uses as much as digits as its factorization.

654186194426221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39813120, while the sum is 61.

The spelling of 654186194426221 in words is "six hundred fifty-four trillion, one hundred eighty-six billion, one hundred ninety-four million, four hundred twenty-six thousand, two hundred twenty-one".