662378397649 has 2 divisors, whose sum is σ = 662378397650. Its totient is φ = 662378397648.

The previous prime is 662378397643. The next prime is 662378397671. The reversal of 662378397649 is 946793873266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 431649000000 + 230729397649 = 657000^2 + 480343^2 .

It is a cyclic number.

It is not a de Polignac number, because 662378397649 - 2²⁷ = 662244179921 is a prime.

It is not a weakly prime, because it can be changed into another prime (662378397643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331189198824 + 331189198825.

It is an arithmetic number, because the mean of its divisors is an integer number (331189198825).

Almost surely, 2^662378397649 is an apocalyptic number.

It is an amenable number.

662378397649 is a deficient number, since it is larger than the sum of its proper divisors (1).

662378397649 is an equidigital number, since it uses as much as digits as its factorization.

662378397649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493807104, while the sum is 70.

The spelling of 662378397649 in words is "six hundred sixty-two billion, three hundred seventy-eight million, three hundred ninety-seven thousand, six hundred forty-nine".