1966428469 has 2 divisors, whose sum is σ = 1966428470. Its totient is φ = 1966428468.

The previous prime is 1966428461. The next prime is 1966428473. The reversal of 1966428469 is 9648246691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1288451025 + 677977444 = 35895^2 + 26038^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966428469 - 2³ = 1966428461 is a prime.

It is a super-2 number, since 2×1966428469² = 7733681847387367922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966428461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983214234 + 983214235.

It is an arithmetic number, because the mean of its divisors is an integer number (983214235).

Almost surely, 2^1966428469 is an apocalyptic number.

It is an amenable number.

1966428469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966428469 is an equidigital number, since it uses as much as digits as its factorization.

1966428469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 55.

The square root of 1966428469 is about 44344.4299658931. The cubic root of 1966428469 is about 1252.8316539318.

The spelling of 1966428469 in words is "one billion, nine hundred sixty-six million, four hundred twenty-eight thousand, four hundred sixty-nine".