999697999987 has 2 divisors, whose sum is σ = 999697999988. Its totient is φ = 999697999986.

The previous prime is 999697999907. The next prime is 999698000071. The reversal of 999697999987 is 789999796999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999697999987 - 2²³ = 999689611379 is a prime.

It is a super-3 number, since 3×999697999987³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 999697999892 and 999697999901.

It is not a weakly prime, because it can be changed into another prime (999697999907) 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 as a sum of consecutive naturals, namely, 499848999993 + 499848999994.

It is an arithmetic number, because the mean of its divisors is an integer number (499848999994).

Almost surely, 2^999697999987 is an apocalyptic number.

999697999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

999697999987 is an equidigital number, since it uses as much as digits as its factorization.

999697999987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 101245887792, while the sum is 100.

The spelling of 999697999987 in words is "nine hundred ninety-nine billion, six hundred ninety-seven million, nine hundred ninety-nine thousand, nine hundred eighty-seven".