1661134503 has 16 divisors (see below), whose sum is σ = 2533570560. Its totient is φ = 948350496.

The previous prime is 1661134487. The next prime is 1661134513. The reversal of 1661134503 is 3054311661.

It is not a de Polignac number, because 1661134503 - 2⁴ = 1661134487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661134513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12375 + ... + 58952.

It is an arithmetic number, because the mean of its divisors is an integer number (158348160).

Almost surely, 2^1661134503 is an apocalyptic number.

1661134503 is a deficient number, since it is larger than the sum of its proper divisors (872436057).

1661134503 is a wasteful number, since it uses less digits than its factorization.

1661134503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72446.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1661134503 is about 40757.0178374228. The cubic root of 1661134503 is about 1184.3178263121.

The spelling of 1661134503 in words is "one billion, six hundred sixty-one million, one hundred thirty-four thousand, five hundred three".