1966550459 has 2 divisors, whose sum is σ = 1966550460. Its totient is φ = 1966550458.

The previous prime is 1966550419. The next prime is 1966550473. The reversal of 1966550459 is 9540556691.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9540556691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1966550459 - 2⁸ = 1966550203 is a prime.

It is a super-2 number, since 2×1966550459² = 7734641415586221362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1966550419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983275229 + 983275230.

It is an arithmetic number, because the mean of its divisors is an integer number (983275230).

Almost surely, 2^1966550459 is an apocalyptic number.

1966550459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966550459 is an equidigital number, since it uses as much as digits as its factorization.

1966550459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 50.

The square root of 1966550459 is about 44345.8054273457. The cubic root of 1966550459 is about 1252.8575604209.

The spelling of 1966550459 in words is "one billion, nine hundred sixty-six million, five hundred fifty thousand, four hundred fifty-nine".