1663426069 has 2 divisors, whose sum is σ = 1663426070. Its totient is φ = 1663426068.

The previous prime is 1663426043. The next prime is 1663426099. The reversal of 1663426069 is 9606243661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1516167844 + 147258225 = 38938^2 + 12135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663426069 - 2⁹ = 1663425557 is a prime.

It is a super-2 number, since 2×1663426069² = 5533972574057585522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663426099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831713034 + 831713035.

It is an arithmetic number, because the mean of its divisors is an integer number (831713035).

Almost surely, 2^1663426069 is an apocalyptic number.

It is an amenable number.

1663426069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663426069 is an equidigital number, since it uses as much as digits as its factorization.

1663426069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 43.

The square root of 1663426069 is about 40785.1206814446. The cubic root of 1663426069 is about 1184.8621722469.

The spelling of 1663426069 in words is "one billion, six hundred sixty-three million, four hundred twenty-six thousand, sixty-nine".