999697999988 has 12 divisors (see below), whose sum is σ = 1759584053220. Its totient is φ = 496959699072.

The previous prime is 999697999987. The next prime is 999698000071. The reversal of 999697999988 is 889999796999.

It can be written as a sum of positive squares in 2 ways, for example, as 397230188644 + 602467811344 = 630262^2 + 776188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999697999987) 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, 722324453 + ... + 722325836.

It is an arithmetic number, because the mean of its divisors is an integer number (146632004435).

Almost surely, 2^999697999988 is an apocalyptic number.

It is an amenable number.

999697999988 is a deficient number, since it is larger than the sum of its proper divisors (759886053232).

999697999988 is a wasteful number, since it uses less digits than its factorization.

999697999988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444650466 (or 1444650464 counting only the distinct ones).

The product of its digits is 115709586048, while the sum is 101.

The spelling of 999697999988 in words is "nine hundred ninety-nine billion, six hundred ninety-seven million, nine hundred ninety-nine thousand, nine hundred eighty-eight".