1661496003 has 16 divisors (see below), whose sum is σ = 2606268960. Its totient is φ = 1042507008.

The previous prime is 1661495981. The next prime is 1661496007. The reversal of 1661496003 is 3006941661.

1661496003 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 49 + 600 + 3 = 666.

It is not a de Polignac number, because 1661496003 - 2²⁰ = 1660447427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1661496007) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1809450 + ... + 1810367.

It is an arithmetic number, because the mean of its divisors is an integer number (162891810).

Almost surely, 2^1661496003 is an apocalyptic number.

1661496003 is a deficient number, since it is larger than the sum of its proper divisors (944772957).

1661496003 is a wasteful number, since it uses less digits than its factorization.

1661496003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3619843 (or 3619837 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1661496003 is about 40761.4524152415. The cubic root of 1661496003 is about 1184.4037314250.

The spelling of 1661496003 in words is "one billion, six hundred sixty-one million, four hundred ninety-six thousand, three".