669006761 has 2 divisors, whose sum is σ = 669006762. Its totient is φ = 669006760.

The previous prime is 669006749. The next prime is 669006787. The reversal of 669006761 is 167600966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656333161 + 12673600 = 25619^2 + 3560^2 .

It is a cyclic number.

It is not a de Polignac number, because 669006761 - 2⁶ = 669006697 is a prime.

It is a super-2 number, since 2×669006761² = 895140092527422242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669006721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334503380 + 334503381.

It is an arithmetic number, because the mean of its divisors is an integer number (334503381).

Almost surely, 2^669006761 is an apocalyptic number.

It is an amenable number.

669006761 is a deficient number, since it is larger than the sum of its proper divisors (1).

669006761 is an equidigital number, since it uses as much as digits as its factorization.

669006761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 669006761 is about 25865.1650101058. The cubic root of 669006761 is about 874.6014014699.

The spelling of 669006761 in words is "six hundred sixty-nine million, six thousand, seven hundred sixty-one".