1661403403 has 8 divisors (see below), whose sum is σ = 1816326720. Its totient is φ = 1507127880.

The previous prime is 1661403391. The next prime is 1661403407. The reversal of 1661403403 is 3043041661.

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 1661403403 - 2⁹ = 1661402891 is a prime.

It is a super-2 number, since 2×1661403403² = 5520522534999960818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661403407) 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, 156573 + ... + 166846.

It is an arithmetic number, because the mean of its divisors is an integer number (227040840).

Almost surely, 2^1661403403 is an apocalyptic number.

1661403403 is a deficient number, since it is larger than the sum of its proper divisors (154923317).

1661403403 is a wasteful number, since it uses less digits than its factorization.

1661403403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323897.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1661403403 is about 40760.3165223235. The cubic root of 1661403403 is about 1184.3817275957.

The spelling of 1661403403 in words is "one billion, six hundred sixty-one million, four hundred three thousand, four hundred three".