1663358322825 has 36 divisors (see below), whose sum is σ = 3154510144188. Its totient is φ = 834940646400.

The previous prime is 1663358322803. The next prime is 1663358322833. The reversal of 1663358322825 is 5282238533661.

1663358322825 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 358 + 3 + 2 + 282 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 19290709881 + 1644067612944 = 138891^2 + 1282212^2 .

It is not a de Polignac number, because 1663358322825 - 2⁹ = 1663358322313 is a prime.

It is a super-4 number, since 4×1663358322825⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 217428636 + ... + 217436285.

It is an arithmetic number, because the mean of its divisors is an integer number (87625281783).

Almost surely, 2^{1663358322825} is an apocalyptic number.

1663358322825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1663358322825 is a deficient number, since it is larger than the sum of its proper divisors (1491151821363).

1663358322825 is a wasteful number, since it uses less digits than its factorization.

1663358322825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434864954 (or 434864946 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 54.

The spelling of 1663358322825 in words is "one trillion, six hundred sixty-three billion, three hundred fifty-eight million, three hundred twenty-two thousand, eight hundred twenty-five".