240561690402721 has 4 divisors (see below), whose sum is σ = 241320560088852. Its totient is φ = 239802820716592.

The previous prime is 240561690402701. The next prime is 240561690402727. The reversal of 240561690402721 is 127204096165042.

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 67463224960000 + 173098465442721 = 8213600^2 + 13156689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240561690402721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240561690402727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379434842590 + ... + 379434843223.

It is an arithmetic number, because the mean of its divisors is an integer number (60330140022213).

Almost surely, 2^{240561690402721} is an apocalyptic number.

It is an amenable number.

240561690402721 is a deficient number, since it is larger than the sum of its proper divisors (758869686131).

240561690402721 is an equidigital number, since it uses as much as digits as its factorization.

240561690402721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758869686130.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 240561690402721 in words is "two hundred forty trillion, five hundred sixty-one billion, six hundred ninety million, four hundred two thousand, seven hundred twenty-one".