1669287157 has 2 divisors, whose sum is σ = 1669287158. Its totient is φ = 1669287156.

The previous prime is 1669287121. The next prime is 1669287167. The reversal of 1669287157 is 7517829661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1665129636 + 4157521 = 40806^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669287157 - 2⁷ = 1669287029 is a prime.

It is a super-2 number, since 2×1669287157² = 5573039225050285298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669287107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834643578 + 834643579.

It is an arithmetic number, because the mean of its divisors is an integer number (834643579).

Almost surely, 2^1669287157 is an apocalyptic number.

It is an amenable number.

1669287157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669287157 is an equidigital number, since it uses as much as digits as its factorization.

1669287157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 52.

The square root of 1669287157 is about 40856.9107618283. The cubic root of 1669287157 is about 1186.2521630812.

The spelling of 1669287157 in words is "one billion, six hundred sixty-nine million, two hundred eighty-seven thousand, one hundred fifty-seven".