669166061 has 2 divisors, whose sum is σ = 669166062. Its totient is φ = 669166060.

The previous prime is 669165953. The next prime is 669166079. The reversal of 669166061 is 160661966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437060836 + 232105225 = 20906^2 + 15235^2 .

It is a cyclic number.

It is not a de Polignac number, because 669166061 - 2¹⁰ = 669165037 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669166081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334583030 + 334583031.

It is an arithmetic number, because the mean of its divisors is an integer number (334583031).

Almost surely, 2^669166061 is an apocalyptic number.

It is an amenable number.

669166061 is a deficient number, since it is larger than the sum of its proper divisors (1).

669166061 is an equidigital number, since it uses as much as digits as its factorization.

669166061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 669166061 is about 25868.2442581633. The cubic root of 669166061 is about 874.6708142943.

The spelling of 669166061 in words is "six hundred sixty-nine million, one hundred sixty-six thousand, sixty-one".