9999999667 has 8 divisors (see below), whose sum is σ = 11644204896. Its totient is φ = 8409702912.

The previous prime is 9999999661. The next prime is 9999999673. The reversal of 9999999667 is 7669999999.

It is an interprime number because it is at equal distance from previous prime (9999999661) and next prime (9999999673).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9999999667 - 2¹¹ = 9999997619 is a prime.

It is a super-2 number, since 2×9999999667² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999999661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13476718 + ... + 13477459.

It is an arithmetic number, because the mean of its divisors is an integer number (1455525612).

Almost surely, 2^9999999667 is an apocalyptic number.

9999999667 is a deficient number, since it is larger than the sum of its proper divisors (1644205229).

9999999667 is a wasteful number, since it uses less digits than its factorization.

9999999667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26954237.

The product of its digits is 1205308188, while the sum is 82.

The square root of 9999999667 is about 99999.9983350000. The cubic root of 9999999667 is about 2154.4346661177.

The spelling of 9999999667 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred sixty-seven".