999998500001 has 4 divisors (see below), whose sum is σ = 1001234592900. Its totient is φ = 998762407104.

The previous prime is 999998499991. The next prime is 999998500037. The reversal of 999998500001 is 100005899999.

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

It can be written as a sum of positive squares in 2 ways, for example, as 685054182400 + 314944317601 = 827680^2 + 561199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999998500001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999998500051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618045236 + ... + 618046853.

It is an arithmetic number, because the mean of its divisors is an integer number (250308648225).

Almost surely, 2^999998500001 is an apocalyptic number.

It is an amenable number.

999998500001 is a deficient number, since it is larger than the sum of its proper divisors (1236092899).

999998500001 is a wasteful number, since it uses less digits than its factorization.

999998500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236092898.

The product of its (nonzero) digits is 2361960, while the sum is 59.

The spelling of 999998500001 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, five hundred thousand, one".