261665642034422 has 8 divisors (see below), whose sum is σ = 392503969156656. Its totient is φ = 130830985648872.

The previous prime is 261665642034421. The next prime is 261665642034449. The reversal of 261665642034422 is 224430246566162.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261665642034421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 917505953 + ... + 917791100.

It is an arithmetic number, because the mean of its divisors is an integer number (49062996144582).

Almost surely, 2^{261665642034422} is an apocalyptic number.

261665642034422 is a deficient number, since it is larger than the sum of its proper divisors (130838327122234).

261665642034422 is a wasteful number, since it uses less digits than its factorization.

261665642034422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835368342.

The product of its (nonzero) digits is 19906560, while the sum is 53.

The spelling of 261665642034422 in words is "two hundred sixty-one trillion, six hundred sixty-five billion, six hundred forty-two million, thirty-four thousand, four hundred twenty-two".