247666997 has 2 divisors, whose sum is σ = 247666998. Its totient is φ = 247666996.

The previous prime is 247666963. The next prime is 247667023. The reversal of 247666997 is 799666742.

247666997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247558756 + 108241 = 15734^2 + 329^2 .

It is a cyclic number.

It is not a de Polignac number, because 247666997 - 2¹⁰ = 247665973 is a prime.

It is a super-2 number, since 2×247666997² = 122677882805996018, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247666597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123833498 + 123833499.

It is an arithmetic number, because the mean of its divisors is an integer number (123833499).

Almost surely, 2^247666997 is an apocalyptic number.

It is an amenable number.

247666997 is a deficient number, since it is larger than the sum of its proper divisors (1).

247666997 is an equidigital number, since it uses as much as digits as its factorization.

247666997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 56.

The square root of 247666997 is about 15737.4393406297. The cubic root of 247666997 is about 627.9947977513.

The spelling of 247666997 in words is "two hundred forty-seven million, six hundred sixty-six thousand, nine hundred ninety-seven".