66700400653 has 2 divisors, whose sum is σ = 66700400654. Its totient is φ = 66700400652.

The previous prime is 66700400633. The next prime is 66700400747. The reversal of 66700400653 is 35600400766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64799266249 + 1901134404 = 254557^2 + 43602^2 .

It is a cyclic number.

It is not a de Polignac number, because 66700400653 - 2¹³ = 66700392461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66700400623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33350200326 + 33350200327.

It is an arithmetic number, because the mean of its divisors is an integer number (33350200327).

Almost surely, 2^66700400653 is an apocalyptic number.

It is an amenable number.

66700400653 is a deficient number, since it is larger than the sum of its proper divisors (1).

66700400653 is an equidigital number, since it uses as much as digits as its factorization.

66700400653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 37.

The spelling of 66700400653 in words is "sixty-six billion, seven hundred million, four hundred thousand, six hundred fifty-three".