1663959473 has 8 divisors (see below), whose sum is σ = 1922006880. Its totient is φ = 1423708480.

The previous prime is 1663959421. The next prime is 1663959491. The reversal of 1663959473 is 3749593661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1663959473 - 2⁸ = 1663959217 is a prime.

It is a super-2 number, since 2×1663959473² = 5537522255572875458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663959413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4448903 + ... + 4449276.

It is an arithmetic number, because the mean of its divisors is an integer number (240250860).

Almost surely, 2^1663959473 is an apocalyptic number.

It is an amenable number.

1663959473 is a deficient number, since it is larger than the sum of its proper divisors (258047407).

1663959473 is a wasteful number, since it uses less digits than its factorization.

1663959473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8898207.

The product of its digits is 3674160, while the sum is 53.

The square root of 1663959473 is about 40791.6593558046. The cubic root of 1663959473 is about 1184.9888070061.

The spelling of 1663959473 in words is "one billion, six hundred sixty-three million, nine hundred fifty-nine thousand, four hundred seventy-three".