1999268556 has 48 divisors (see below), whose sum is σ = 4706069760. Its totient is φ = 660573760.

The previous prime is 1999268549. The next prime is 1999268573. The reversal of 1999268556 is 6558629991.

It is a self number, because there is not a number n which added to its sum of digits gives 1999268556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 838486 + ... + 840866.

It is an arithmetic number, because the mean of its divisors is an integer number (98043120).

Almost surely, 2^1999268556 is an apocalyptic number.

It is an amenable number.

1999268556 is an abundant number, since it is smaller than the sum of its proper divisors (2706801204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999268556 is a wasteful number, since it uses less digits than its factorization.

1999268556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2974 (or 2972 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 60.

The square root of 1999268556 is about 44713.1810096307. The cubic root of 1999268556 is about 1259.7674375515.

The spelling of 1999268556 in words is "one billion, nine hundred ninety-nine million, two hundred sixty-eight thousand, five hundred fifty-six".