1663754669 has 2 divisors, whose sum is σ = 1663754670. Its totient is φ = 1663754668.

The previous prime is 1663754639. The next prime is 1663754707. The reversal of 1663754669 is 9664573661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1342269769 + 321484900 = 36637^2 + 17930^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663754669 - 2¹² = 1663750573 is a prime.

It is a super-2 number, since 2×1663754669² = 5536159197238599122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1663754669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663754639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831877334 + 831877335.

It is an arithmetic number, because the mean of its divisors is an integer number (831877335).

Almost surely, 2^1663754669 is an apocalyptic number.

It is an amenable number.

1663754669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663754669 is an equidigital number, since it uses as much as digits as its factorization.

1663754669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 53.

The square root of 1663754669 is about 40789.1489124252. The cubic root of 1663754669 is about 1184.9401879524.

The spelling of 1663754669 in words is "one billion, six hundred sixty-three million, seven hundred fifty-four thousand, six hundred sixty-nine".