1661232404 has 24 divisors (see below), whose sum is σ = 3238745160. Its totient is φ = 740283264.

The previous prime is 1661232403. The next prime is 1661232413. The reversal of 1661232404 is 4042321661.

It can be written as a sum of positive squares in 4 ways, for example, as 310816900 + 1350415504 = 17630^2 + 36748^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661232403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 549299 + ... + 552314.

It is an arithmetic number, because the mean of its divisors is an integer number (134947715).

Almost surely, 2^1661232404 is an apocalyptic number.

It is an amenable number.

1661232404 is a deficient number, since it is larger than the sum of its proper divisors (1577512756).

1661232404 is a wasteful number, since it uses less digits than its factorization.

1661232404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101659 (or 1101657 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 1661232404 is about 40758.2188521530. The cubic root of 1661232404 is about 1184.3410922631.

The spelling of 1661232404 in words is "one billion, six hundred sixty-one million, two hundred thirty-two thousand, four hundred four".