1661428853 has 32 divisors (see below), whose sum is σ = 2039862528. Its totient is φ = 1320883200.

The previous prime is 1661428843. The next prime is 1661428861. The reversal of 1661428853 is 3588241661.

It is not a de Polignac number, because 1661428853 - 2¹⁰ = 1661427829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661428843) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3070763 + ... + 3071303.

It is an arithmetic number, because the mean of its divisors is an integer number (63745704).

Almost surely, 2^1661428853 is an apocalyptic number.

It is an amenable number.

1661428853 is a deficient number, since it is larger than the sum of its proper divisors (378433675).

1661428853 is a wasteful number, since it uses less digits than its factorization.

1661428853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893.

The product of its digits is 276480, while the sum is 44.

The square root of 1661428853 is about 40760.6287120304. The cubic root of 1661428853 is about 1184.3877751659.

The spelling of 1661428853 in words is "one billion, six hundred sixty-one million, four hundred twenty-eight thousand, eight hundred fifty-three".