1663531990 has 8 divisors (see below), whose sum is σ = 2994357600. Its totient is φ = 665412792.

The previous prime is 1663531981. The next prime is 1663532009. The reversal of 1663531990 is 991353661.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83176590 + ... + 83176609.

It is an arithmetic number, because the mean of its divisors is an integer number (374294700).

Almost surely, 2^1663531990 is an apocalyptic number.

1663531990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1663531990 is a deficient number, since it is larger than the sum of its proper divisors (1330825610).

1663531990 is a wasteful number, since it uses less digits than its factorization.

1663531990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166353206.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 1663531990 is about 40786.4191858025. The cubic root of 1663531990 is about 1184.8873209695.

The spelling of 1663531990 in words is "one billion, six hundred sixty-three million, five hundred thirty-one thousand, nine hundred ninety".