261220520122 has 8 divisors (see below), whose sum is σ = 391833060372. Its totient is φ = 130609500000.

The previous prime is 261220520117. The next prime is 261220520161. The reversal of 261220520122 is 221025022162.

It can be written as a sum of positive squares in 2 ways, for example, as 259263254041 + 1957266081 = 509179^2 + 44241^2 .

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

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, 276222 + ... + 773782.

Almost surely, 2^261220520122 is an apocalyptic number.

261220520122 is a deficient number, since it is larger than the sum of its proper divisors (130612540250).

261220520122 is a wasteful number, since it uses less digits than its factorization.

261220520122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760064.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 261220520122 its reverse (221025022162), we get a palindrome (482245542284).

The spelling of 261220520122 in words is "two hundred sixty-one billion, two hundred twenty million, five hundred twenty thousand, one hundred twenty-two".