247666945 has 8 divisors (see below), whose sum is σ = 297337536. Its totient is φ = 198042096.

The previous prime is 247666901. The next prime is 247666961. The reversal of 247666945 is 549666742.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247666945 is a prime.

It is a super-2 number, since 2×247666945² = 122677831291266050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1894 + ... + 22336.

It is an arithmetic number, because the mean of its divisors is an integer number (37167192).

Almost surely, 2^247666945 is an apocalyptic number.

It is an amenable number.

247666945 is a deficient number, since it is larger than the sum of its proper divisors (49670591).

247666945 is a wasteful number, since it uses less digits than its factorization.

247666945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22871.

The product of its digits is 2177280, while the sum is 49.

The square root of 247666945 is about 15737.4376885184. The cubic root of 247666945 is about 627.9947538001.

The spelling of 247666945 in words is "two hundred forty-seven million, six hundred sixty-six thousand, nine hundred forty-five".