669786941 has 2 divisors, whose sum is σ = 669786942. Its totient is φ = 669786940.

The previous prime is 669786919. The next prime is 669787021. The reversal of 669786941 is 149687966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 611325625 + 58461316 = 24725^2 + 7646^2 .

It is a cyclic number.

It is not a de Polignac number, because 669786941 - 2²² = 665592637 is a prime.

It is a super-2 number, since 2×669786941² = 897229092668274962, 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 (669786241) 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, 334893470 + 334893471.

It is an arithmetic number, because the mean of its divisors is an integer number (334893471).

Almost surely, 2^669786941 is an apocalyptic number.

It is an amenable number.

669786941 is a deficient number, since it is larger than the sum of its proper divisors (1).

669786941 is an equidigital number, since it uses as much as digits as its factorization.

669786941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 56.

The square root of 669786941 is about 25880.2422902105. The cubic root of 669786941 is about 874.9412492798.

The spelling of 669786941 in words is "six hundred sixty-nine million, seven hundred eighty-six thousand, nine hundred forty-one".