66674007999 has 24 divisors (see below), whose sum is σ = 100649682432. Its totient is φ = 42450959760.

The previous prime is 66674007989. The next prime is 66674008001. The reversal of 66674007999 is 99970047666.

It is not a de Polignac number, because 66674007999 - 2²⁷ = 66539790271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66674007989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114987 + ... + 382844.

It is an arithmetic number, because the mean of its divisors is an integer number (4193736768).

Almost surely, 2^66674007999 is an apocalyptic number.

66674007999 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

66674007999 is a deficient number, since it is larger than the sum of its proper divisors (33975674433).

66674007999 is a wasteful number, since it uses less digits than its factorization.

66674007999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498507 (or 498504 counting only the distinct ones).

The product of its (nonzero) digits is 30862944, while the sum is 63.

The spelling of 66674007999 in words is "sixty-six billion, six hundred seventy-four million, seven thousand, nine hundred ninety-nine".