1999550026 has 4 divisors (see below), whose sum is σ = 2999325042. Its totient is φ = 999775012.

The previous prime is 1999550023. The next prime is 1999550083. The reversal of 1999550026 is 6200559991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1209996225 + 789553801 = 34785^2 + 28099^2 .

It is not an unprimeable number, because it can be changed into a prime (1999550023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499887505 + ... + 499887508.

Almost surely, 2^1999550026 is an apocalyptic number.

1999550026 is a deficient number, since it is larger than the sum of its proper divisors (999775016).

1999550026 is an equidigital number, since it uses as much as digits as its factorization.

1999550026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999775015.

The product of its (nonzero) digits is 218700, while the sum is 46.

The square root of 1999550026 is about 44716.3284047338. The cubic root of 1999550026 is about 1259.8265541887.

The spelling of 1999550026 in words is "one billion, nine hundred ninety-nine million, five hundred fifty thousand, twenty-six".