662654021 has 2 divisors, whose sum is σ = 662654022. Its totient is φ = 662654020.

The previous prime is 662653991. The next prime is 662654023. The reversal of 662654021 is 120456266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 562353796 + 100300225 = 23714^2 + 10015^2 .

It is a cyclic number.

It is not a de Polignac number, because 662654021 - 2²⁶ = 595545157 is a prime.

It is a super-2 number, since 2×662654021² = 878220703094936882, which contains 22 as substring.

Together with 662654023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662654023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331327010 + 331327011.

It is an arithmetic number, because the mean of its divisors is an integer number (331327011).

Almost surely, 2^662654021 is an apocalyptic number.

It is an amenable number.

662654021 is a deficient number, since it is larger than the sum of its proper divisors (1).

662654021 is an equidigital number, since it uses as much as digits as its factorization.

662654021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 662654021 is about 25742.0671469872. The cubic root of 662654021 is about 871.8242520464.

The spelling of 662654021 in words is "six hundred sixty-two million, six hundred fifty-four thousand, twenty-one".