1663263405 has 24 divisors (see below), whose sum is σ = 2960911512. Its totient is φ = 863097984.

The previous prime is 1663263383. The next prime is 1663263421. The reversal of 1663263405 is 5043623661.

1663263405 is a `hidden beast` number, since 16 + 6 + 3 + 2 + 634 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 275626404 + 1387637001 = 16602^2 + 37251^2 .

It is not a de Polignac number, because 1663263405 - 2⁶ = 1663263341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1663263405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 497814 + ... + 501143.

It is an arithmetic number, because the mean of its divisors is an integer number (123371313).

Almost surely, 2^1663263405 is an apocalyptic number.

1663263405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1663263405 is a deficient number, since it is larger than the sum of its proper divisors (1297648107).

1663263405 is a wasteful number, since it uses less digits than its factorization.

1663263405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999005 (or 999002 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 1663263405 is about 40783.1264740701. The cubic root of 1663263405 is about 1184.8235490088.

The spelling of 1663263405 in words is "one billion, six hundred sixty-three million, two hundred sixty-three thousand, four hundred five".