261544417251022 has 8 divisors (see below), whose sum is σ = 392317703836416. Its totient is φ = 130771849305552.

The previous prime is 261544417251011. The next prime is 261544417251041. The reversal of 261544417251022 is 220152714445162.

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 pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178749198 + ... + 180206449.

It is an arithmetic number, because the mean of its divisors is an integer number (49039712979552).

Almost surely, 2^{261544417251022} is an apocalyptic number.

261544417251022 is a deficient number, since it is larger than the sum of its proper divisors (130773286585394).

261544417251022 is a wasteful number, since it uses less digits than its factorization.

261544417251022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359319962.

The product of its (nonzero) digits is 1075200, while the sum is 46.

The spelling of 261544417251022 in words is "two hundred sixty-one trillion, five hundred forty-four billion, four hundred seventeen million, two hundred fifty-one thousand, twenty-two".