66601947249 has 8 divisors (see below), whose sum is σ = 98669551520. Its totient is φ = 44401298148.

The previous prime is 66601947239. The next prime is 66601947257. The reversal of 66601947249 is 94274910666.

It is a happy number.

It is not a de Polignac number, because 66601947249 - 2¹² = 66601943153 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66601947195 and 66601947204.

It is not an unprimeable number, because it can be changed into a prime (66601947239) 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, 1233369367 + ... + 1233369420.

It is an arithmetic number, because the mean of its divisors is an integer number (12333693940).

Almost surely, 2^66601947249 is an apocalyptic number.

It is an amenable number.

66601947249 is a deficient number, since it is larger than the sum of its proper divisors (32067604271).

66601947249 is a wasteful number, since it uses less digits than its factorization.

66601947249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466738796 (or 2466738790 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 66601947249 in words is "sixty-six billion, six hundred one million, nine hundred forty-seven thousand, two hundred forty-nine".