999697999999 has 4 divisors (see below), whose sum is σ = 999922302864. Its totient is φ = 999473697136.

The previous prime is 999697999987. The next prime is 999698000071. The reversal of 999697999999 is 999999796999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999697999999 is a prime.

It is a Duffinian number.

999697999999 is a modest number, since divided by 999999 gives 999697 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 999697999898 and 999697999907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999697999199) 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, 112144747 + ... + 112153660.

It is an arithmetic number, because the mean of its divisors is an integer number (249980575716).

Almost surely, 2^999697999999 is an apocalyptic number.

999697999999 is a deficient number, since it is larger than the sum of its proper divisors (224302865).

999697999999 is a wasteful number, since it uses less digits than its factorization.

999697999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224302864.

The product of its digits is 146444944842, while the sum is 103.

The spelling of 999697999999 in words is "nine hundred ninety-nine billion, six hundred ninety-seven million, nine hundred ninety-nine thousand, nine hundred ninety-nine".