999997999797 has 32 divisors (see below), whose sum is σ = 1372262726016. Its totient is φ = 647354240000.

The previous prime is 999997999757. The next prime is 999997999799. The reversal of 999997999797 is 797999799999.

It is a cyclic number.

It is not a de Polignac number, because 999997999797 - 2¹⁵ = 999997967029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999997999799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93165043 + ... + 93175775.

It is an arithmetic number, because the mean of its divisors is an integer number (42883210188).

Almost surely, 2^999997999797 is an apocalyptic number.

It is an amenable number.

999997999797 is a deficient number, since it is larger than the sum of its proper divisors (372264726219).

999997999797 is a wasteful number, since it uses less digits than its factorization.

999997999797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14261.

The product of its digits is 132885227727, while the sum is 102.

The spelling of 999997999797 in words is "nine hundred ninety-nine billion, nine hundred ninety-seven million, nine hundred ninety-nine thousand, seven hundred ninety-seven".