1661633004 has 24 divisors (see below), whose sum is σ = 3967311040. Its totient is φ = 540996624.

The previous prime is 1661632997. The next prime is 1661633027. The reversal of 1661633004 is 4003361661.

It is a super-2 number, since 2×1661633004² = 5522048479964128032, which contains 22 as substring.

It is an unprimeable number.

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, 1609594 + ... + 1610625.

Almost surely, 2^1661633004 is an apocalyptic number.

It is an amenable number.

1661633004 is an abundant number, since it is smaller than the sum of its proper divisors (2305678036).

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

1661633004 is a wasteful number, since it uses less digits than its factorization.

1661633004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220269 (or 3220267 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 1661633004 is about 40763.1329021703. The cubic root of 1661633004 is about 1184.4362844245.

Adding to 1661633004 its reverse (4003361661), we get a palindrome (5664994665).

The spelling of 1661633004 in words is "one billion, six hundred sixty-one million, six hundred thirty-three thousand, four".