662981797 has 2 divisors, whose sum is σ = 662981798. Its totient is φ = 662981796.

The previous prime is 662981791. The next prime is 662981843. The reversal of 662981797 is 797189266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640646721 + 22335076 = 25311^2 + 4726^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-662981797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662981791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331490898 + 331490899.

It is an arithmetic number, because the mean of its divisors is an integer number (331490899).

Almost surely, 2^662981797 is an apocalyptic number.

It is an amenable number.

662981797 is a deficient number, since it is larger than the sum of its proper divisors (1).

662981797 is an equidigital number, since it uses as much as digits as its factorization.

662981797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 55.

The square root of 662981797 is about 25748.4329037711. The cubic root of 662981797 is about 871.9679750920.

The spelling of 662981797 in words is "six hundred sixty-two million, nine hundred eighty-one thousand, seven hundred ninety-seven".