669948281 has 2 divisors, whose sum is σ = 669948282. Its totient is φ = 669948280.

The previous prime is 669948277. The next prime is 669948287. The reversal of 669948281 is 182849966.

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., 657409600 + 12538681 = 25640^2 + 3541^2 .

It is a cyclic number.

It is not a de Polignac number, because 669948281 - 2² = 669948277 is a prime.

It is a super-2 number, since 2×669948281² = 897661398429709922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669948287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334974140 + 334974141.

It is an arithmetic number, because the mean of its divisors is an integer number (334974141).

Almost surely, 2^669948281 is an apocalyptic number.

It is an amenable number.

669948281 is a deficient number, since it is larger than the sum of its proper divisors (1).

669948281 is an equidigital number, since it uses as much as digits as its factorization.

669948281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 53.

The square root of 669948281 is about 25883.3591521657. The cubic root of 669948281 is about 875.0114963387.

The spelling of 669948281 in words is "six hundred sixty-nine million, nine hundred forty-eight thousand, two hundred eighty-one".