42651720653 has 2 divisors, whose sum is σ = 42651720654. Its totient is φ = 42651720652.

The previous prime is 42651720641. The next prime is 42651720673. The reversal of 42651720653 is 35602715624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42649684324 + 2036329 = 206518^2 + 1427^2 .

It is a cyclic number.

It is not a de Polignac number, because 42651720653 - 2⁴ = 42651720637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42651720653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42651720613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21325860326 + 21325860327.

It is an arithmetic number, because the mean of its divisors is an integer number (21325860327).

Almost surely, 2^42651720653 is an apocalyptic number.

It is an amenable number.

42651720653 is a deficient number, since it is larger than the sum of its proper divisors (1).

42651720653 is an equidigital number, since it uses as much as digits as its factorization.

42651720653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 42651720653 in words is "forty-two billion, six hundred fifty-one million, seven hundred twenty thousand, six hundred fifty-three".