261647460066742 has 8 divisors (see below), whose sum is σ = 406004679414000. Its totient is φ = 126312566928744.

The previous prime is 261647460066737. The next prime is 261647460066757. The reversal of 261647460066742 is 247660064746162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2255581552242 + ... + 2255581552357.

It is an arithmetic number, because the mean of its divisors is an integer number (50750584926750).

Almost surely, 2^{261647460066742} is an apocalyptic number.

261647460066742 is a deficient number, since it is larger than the sum of its proper divisors (144357219347258).

261647460066742 is a wasteful number, since it uses less digits than its factorization.

261647460066742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511163104630.

The product of its (nonzero) digits is 97542144, while the sum is 61.

The spelling of 261647460066742 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, four hundred sixty million, sixty-six thousand, seven hundred forty-two".