261847646658 has 24 divisors (see below), whose sum is σ = 610977842748. Its totient is φ = 80568506592.

The previous prime is 261847646639. The next prime is 261847646681. The reversal of 261847646658 is 856646748162.

It is a happy number.

261847646658 is a `hidden beast` number, since 2 + 61 + 8 + 476 + 46 + 65 + 8 = 666.

261847646658 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 252352508409 + 9495138249 = 502347^2 + 97443^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261847646595 and 261847646604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 559503285 + ... + 559503752.

Almost surely, 2^261847646658 is an apocalyptic number.

261847646658 is an abundant number, since it is smaller than the sum of its proper divisors (349130196090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261847646658 is a wasteful number, since it uses less digits than its factorization.

261847646658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119007058 (or 1119007055 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 63.

The spelling of 261847646658 in words is "two hundred sixty-one billion, eight hundred forty-seven million, six hundred forty-six thousand, six hundred fifty-eight".