261078248768 has 14 divisors (see below), whose sum is σ = 518077150026. Its totient is φ = 130539124352.

The previous prime is 261078248687. The next prime is 261078248789. The reversal of 261078248768 is 867842870162.

It can be written as a sum of positive squares in only one way, i.e., 209698053184 + 51380195584 = 457928^2 + 226672^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2039673755 + ... + 2039673882.

Almost surely, 2^261078248768 is an apocalyptic number.

It is an amenable number.

261078248768 is a deficient number, since it is larger than the sum of its proper divisors (256998901258).

261078248768 is an equidigital number, since it uses as much as digits as its factorization.

261078248768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4079347649 (or 4079347639 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 59.

The spelling of 261078248768 in words is "two hundred sixty-one billion, seventy-eight million, two hundred forty-eight thousand, seven hundred sixty-eight".