247990663 has 2 divisors, whose sum is σ = 247990664. Its totient is φ = 247990662.

The previous prime is 247990601. The next prime is 247990693. The reversal of 247990663 is 366099742.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247990663 is a prime.

It is a super-2 number, since 2×247990663² = 122998737870359138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247990693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123995331 + 123995332.

It is an arithmetic number, because the mean of its divisors is an integer number (123995332).

Almost surely, 2^247990663 is an apocalyptic number.

247990663 is a deficient number, since it is larger than the sum of its proper divisors (1).

247990663 is an equidigital number, since it uses as much as digits as its factorization.

247990663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 46.

The square root of 247990663 is about 15747.7192951868. The cubic root of 247990663 is about 628.2682456828.

The spelling of 247990663 in words is "two hundred forty-seven million, nine hundred ninety thousand, six hundred sixty-three".