1999859553 has 12 divisors (see below), whose sum is σ = 2907818368. Its totient is φ = 1324409400.

The previous prime is 1999859539. The next prime is 1999859557. The reversal of 1999859553 is 3559589991.

It is not a de Polignac number, because 1999859553 - 2¹³ = 1999851361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999859557) 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 11 ways as a sum of consecutive naturals, for example, 734425 + ... + 737142.

Almost surely, 2^1999859553 is an apocalyptic number.

It is an amenable number.

1999859553 is a deficient number, since it is larger than the sum of its proper divisors (907958815).

1999859553 is a wasteful number, since it uses less digits than its factorization.

1999859553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471724 (or 1471721 counting only the distinct ones).

The product of its digits is 19683000, while the sum is 63.

The square root of 1999859553 is about 44719.7892772316. The cubic root of 1999859553 is about 1259.8915571826.

The spelling of 1999859553 in words is "one billion, nine hundred ninety-nine million, eight hundred fifty-nine thousand, five hundred fifty-three".