653428738649 has 2 divisors, whose sum is σ = 653428738650. Its totient is φ = 653428738648.

The previous prime is 653428738637. The next prime is 653428738681. The reversal of 653428738649 is 946837824356.

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., 534097872400 + 119330866249 = 730820^2 + 345443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-653428738649 is a prime.

It is not a weakly prime, because it can be changed into another prime (653428738609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 326714369324 + 326714369325.

It is an arithmetic number, because the mean of its divisors is an integer number (326714369325).

Almost surely, 2^653428738649 is an apocalyptic number.

It is an amenable number.

653428738649 is a deficient number, since it is larger than the sum of its proper divisors (1).

653428738649 is an equidigital number, since it uses as much as digits as its factorization.

653428738649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209018880, while the sum is 65.

The spelling of 653428738649 in words is "six hundred fifty-three billion, four hundred twenty-eight million, seven hundred thirty-eight thousand, six hundred forty-nine".