247666117 has 4 divisors (see below), whose sum is σ = 253706796. Its totient is φ = 241625440.

The previous prime is 247666109. The next prime is 247666163. The reversal of 247666117 is 711666742.

247666117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 116769636 + 130896481 = 10806^2 + 11441^2 .

It is a cyclic number.

It is not a de Polignac number, because 247666117 - 2³ = 247666109 is a prime.

It is a super-2 number, since 2×247666117² = 122677011019715378, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 247666117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247646117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3020278 + ... + 3020359.

It is an arithmetic number, because the mean of its divisors is an integer number (63426699).

Almost surely, 2^247666117 is an apocalyptic number.

It is an amenable number.

247666117 is a deficient number, since it is larger than the sum of its proper divisors (6040679).

247666117 is an equidigital number, since it uses as much as digits as its factorization.

247666117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040678.

The product of its digits is 84672, while the sum is 40.

The square root of 247666117 is about 15737.4113817997. The cubic root of 247666117 is about 627.9940539621.

The spelling of 247666117 in words is "two hundred forty-seven million, six hundred sixty-six thousand, one hundred seventeen".