261647463446224 has 10 divisors (see below), whose sum is σ = 506941960427090. Its totient is φ = 130823731723104.

The previous prime is 261647463446219. The next prime is 261647463446227. The reversal of 261647463446224 is 422644364746162.

It can be written as a sum of positive squares in only one way, i.e., 204183179975824 + 57464283470400 = 14289268^2 + 7580520^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261647463446227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8176483232679 + ... + 8176483232710.

It is an arithmetic number, because the mean of its divisors is an integer number (50694196042709).

Almost surely, 2^{261647463446224} is an apocalyptic number.

It is an amenable number.

261647463446224 is a deficient number, since it is larger than the sum of its proper divisors (245294496980866).

261647463446224 is a wasteful number, since it uses less digits than its factorization.

261647463446224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16352966465397 (or 16352966465391 counting only the distinct ones).

The product of its digits is 222953472, while the sum is 61.

The spelling of 261647463446224 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, four hundred sixty-three million, four hundred forty-six thousand, two hundred twenty-four".