669191441 has 2 divisors, whose sum is σ = 669191442. Its totient is φ = 669191440.

The previous prime is 669191431. The next prime is 669191461. The reversal of 669191441 is 144191966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 546624400 + 122567041 = 23380^2 + 11071^2 .

It is a cyclic number.

It is not a de Polignac number, because 669191441 - 2¹⁴ = 669175057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669191431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334595720 + 334595721.

It is an arithmetic number, because the mean of its divisors is an integer number (334595721).

Almost surely, 2^669191441 is an apocalyptic number.

It is an amenable number.

669191441 is a deficient number, since it is larger than the sum of its proper divisors (1).

669191441 is an equidigital number, since it uses as much as digits as its factorization.

669191441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 669191441 is about 25868.7348163763. The cubic root of 669191441 is about 874.6818722692.

The spelling of 669191441 in words is "six hundred sixty-nine million, one hundred ninety-one thousand, four hundred forty-one".