1663223661 has 48 divisors (see below), whose sum is σ = 2664305280. Its totient is φ = 991440000.

The previous prime is 1663223657. The next prime is 1663223669.

1663223661 is a `hidden beast` number, since 16 + 632 + 2 + 3 + 6 + 6 + 1 = 666.

1663223661 is nontrivially palindromic in base 10.

1663223661 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1663223661 - 2² = 1663223657 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663223669) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1809360 + ... + 1810278.

It is an arithmetic number, because the mean of its divisors is an integer number (55506360).

Almost surely, 2^1663223661 is an apocalyptic number.

1663223661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1663223661 is a deficient number, since it is larger than the sum of its proper divisors (1001081619).

1663223661 is a wasteful number, since it uses less digits than its factorization.

1663223661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218 (or 1215 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 1663223661 is about 40782.6392108211. The cubic root of 1663223661 is about 1184.8141117379.

The spelling of 1663223661 in words is "one billion, six hundred sixty-three million, two hundred twenty-three thousand, six hundred sixty-one".