662636669 has 2 divisors, whose sum is σ = 662636670. Its totient is φ = 662636668.

The previous prime is 662636657. The next prime is 662636683. The reversal of 662636669 is 966636266.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 646939225 + 15697444 = 25435^2 + 3962^2 .

It is a cyclic number.

It is not a de Polignac number, because 662636669 - 2¹² = 662632573 is a prime.

It is a super-2 number, since 2×662636669² = 878174710206831122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (662635669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331318334 + 331318335.

It is an arithmetic number, because the mean of its divisors is an integer number (331318335).

Almost surely, 2^662636669 is an apocalyptic number.

It is an amenable number.

662636669 is a deficient number, since it is larger than the sum of its proper divisors (1).

662636669 is an equidigital number, since it uses as much as digits as its factorization.

662636669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 50.

The square root of 662636669 is about 25741.7301089107. The cubic root of 662636669 is about 871.8166422299.

The spelling of 662636669 in words is "six hundred sixty-two million, six hundred thirty-six thousand, six hundred sixty-nine".