1999900565 has 8 divisors (see below), whose sum is σ = 2584486968. Its totient is φ = 1476849600.

The previous prime is 1999900561. The next prime is 1999900589. The reversal of 1999900565 is 5650099991.

It can be written as a sum of positive squares in 4 ways, for example, as 7349521 + 1992551044 = 2711^2 + 44638^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1999900565 - 2² = 1999900561 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 (1999900561) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15383786 + ... + 15383915.

It is an arithmetic number, because the mean of its divisors is an integer number (323060871).

Almost surely, 2^1999900565 is an apocalyptic number.

It is an amenable number.

1999900565 is a deficient number, since it is larger than the sum of its proper divisors (584586403).

1999900565 is a wasteful number, since it uses less digits than its factorization.

1999900565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30767719.

The product of its (nonzero) digits is 984150, while the sum is 53.

The square root of 1999900565 is about 44720.2478190808. The cubic root of 1999900565 is about 1259.9001695072.

The spelling of 1999900565 in words is "one billion, nine hundred ninety-nine million, nine hundred thousand, five hundred sixty-five".