247225554161 has 4 divisors (see below), whose sum is σ = 255750573300. Its totient is φ = 238700535024.

The previous prime is 247225554137. The next prime is 247225554211. The reversal of 247225554161 is 161455522742.

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 118986363136 + 128239191025 = 344944^2 + 358105^2 .

It is a cyclic number.

It is not a de Polignac number, because 247225554161 - 2⁶ = 247225554097 is a prime.

It is a super-2 number, since 2×247225554161² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247225554061) 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, 4262509526 + ... + 4262509583.

It is an arithmetic number, because the mean of its divisors is an integer number (63937643325).

Almost surely, 2^247225554161 is an apocalyptic number.

It is an amenable number.

247225554161 is a deficient number, since it is larger than the sum of its proper divisors (8525019139).

247225554161 is an equidigital number, since it uses as much as digits as its factorization.

247225554161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8525019138.

The product of its digits is 672000, while the sum is 44.

The spelling of 247225554161 in words is "two hundred forty-seven billion, two hundred twenty-five million, five hundred fifty-four thousand, one hundred sixty-one".