247408648661 has 2 divisors, whose sum is σ = 247408648662. Its totient is φ = 247408648660.

The previous prime is 247408648651. The next prime is 247408648777. The reversal of 247408648661 is 166846804742.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246692015761 + 716632900 = 496681^2 + 26770^2 .

It is a cyclic number.

It is not a de Polignac number, because 247408648661 - 2²² = 247404454357 is a prime.

It is a super-2 number, since 2×247408648661² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247408648597 and 247408648606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247408648631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123704324330 + 123704324331.

It is an arithmetic number, because the mean of its divisors is an integer number (123704324331).

Almost surely, 2^247408648661 is an apocalyptic number.

It is an amenable number.

247408648661 is a deficient number, since it is larger than the sum of its proper divisors (1).

247408648661 is an equidigital number, since it uses as much as digits as its factorization.

247408648661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12386304, while the sum is 56.

The spelling of 247408648661 in words is "two hundred forty-seven billion, four hundred eight million, six hundred forty-eight thousand, six hundred sixty-one".