1669407797 has 2 divisors, whose sum is σ = 1669407798. Its totient is φ = 1669407796.

The previous prime is 1669407767. The next prime is 1669407809. The reversal of 1669407797 is 7977049661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1047104881 + 622302916 = 32359^2 + 24946^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669407797 - 2¹⁴ = 1669391413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669407737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834703898 + 834703899.

It is an arithmetic number, because the mean of its divisors is an integer number (834703899).

Almost surely, 2^1669407797 is an apocalyptic number.

It is an amenable number.

1669407797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669407797 is an equidigital number, since it uses as much as digits as its factorization.

1669407797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4000752, while the sum is 56.

The square root of 1669407797 is about 40858.3871071779. The cubic root of 1669407797 is about 1186.2807393536.

The spelling of 1669407797 in words is "one billion, six hundred sixty-nine million, four hundred seven thousand, seven hundred ninety-seven".