667648999 has 8 divisors (see below), whose sum is σ = 703864880. Its totient is φ = 631540800.

The previous prime is 667648921. The next prime is 667649023. The reversal of 667648999 is 999846766.

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 667648999 - 2¹³ = 667640807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667648999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667649999) 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, 14022 + ... + 39139.

It is an arithmetic number, because the mean of its divisors is an integer number (87983110).

Almost surely, 2^667648999 is an apocalyptic number.

667648999 is a deficient number, since it is larger than the sum of its proper divisors (36215881).

667648999 is a wasteful number, since it uses less digits than its factorization.

667648999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53841.

The product of its digits is 35271936, while the sum is 64.

The square root of 667648999 is about 25838.9047562005. The cubic root of 667648999 is about 874.0093273306.

The spelling of 667648999 in words is "six hundred sixty-seven million, six hundred forty-eight thousand, nine hundred ninety-nine".