662965021 has 2 divisors, whose sum is σ = 662965022. Its totient is φ = 662965020.

The previous prime is 662965007. The next prime is 662965103. The reversal of 662965021 is 120569266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 483780025 + 179184996 = 21995^2 + 13386^2 .

It is a cyclic number.

It is not a de Polignac number, because 662965021 - 2⁷ = 662964893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662965321) 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, 331482510 + 331482511.

It is an arithmetic number, because the mean of its divisors is an integer number (331482511).

Almost surely, 2^662965021 is an apocalyptic number.

It is an amenable number.

662965021 is a deficient number, since it is larger than the sum of its proper divisors (1).

662965021 is an equidigital number, since it uses as much as digits as its factorization.

662965021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 662965021 is about 25748.1071343118. The cubic root of 662965021 is about 871.9606203108.

It can be divided in two parts, 66296 and 5021, that added together give a palindrome (71317).

The spelling of 662965021 in words is "six hundred sixty-two million, nine hundred sixty-five thousand, twenty-one".