1663491004 has 96 divisors (see below), whose sum is σ = 3647548800. Its totient is φ = 661118976.

The previous prime is 1663490989. The next prime is 1663491013. The reversal of 1663491004 is 4001943661.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1702164 + ... + 1703140.

It is an arithmetic number, because the mean of its divisors is an integer number (37995300).

Almost surely, 2^1663491004 is an apocalyptic number.

1663491004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663491004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1823774400).

1663491004 is an abundant number, since it is smaller than the sum of its proper divisors (1984057796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663491004 is a wasteful number, since it uses less digits than its factorization.

1663491004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092 (or 1076 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1663491004 is about 40785.9167360500. The cubic root of 1663491004 is about 1184.8775898290.

The spelling of 1663491004 in words is "one billion, six hundred sixty-three million, four hundred ninety-one thousand, four".