1653844959 has 20 divisors (see below), whose sum is σ = 2660603176. Its totient is φ = 1017750096.

The previous prime is 1653844943. The next prime is 1653844967. The reversal of 1653844959 is 9594483561.

1653844959 is a `hidden beast` number, since 16 + 538 + 4 + 4 + 95 + 9 = 666.

It is not a de Polignac number, because 1653844959 - 2⁴ = 1653844943 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 (1653844909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 784249 + ... + 786354.

Almost surely, 2^1653844959 is an apocalyptic number.

1653844959 is a deficient number, since it is larger than the sum of its proper divisors (1006758217).

1653844959 is a wasteful number, since it uses less digits than its factorization.

1653844959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570628 (or 1570619 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The square root of 1653844959 is about 40667.4926569121. The cubic root of 1653844959 is about 1182.5829083971.

The spelling of 1653844959 in words is "one billion, six hundred fifty-three million, eight hundred forty-four thousand, nine hundred fifty-nine".