261222504912 has 30 divisors (see below), whose sum is σ = 731060205122. Its totient is φ = 87074168256.

The previous prime is 261222504901. The next prime is 261222504923. The reversal of 261222504912 is 219405222162.

261222504912 is a `hidden beast` number, since 2 + 61 + 2 + 2 + 2 + 504 + 91 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (261222504901) and next prime (261222504923).

It can be written as a sum of positive squares in only one way, i.e., 228640810896 + 32581694016 = 478164^2 + 180504^2 .

It is a super-3 number, since 3×261222504912³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 907022443 + ... + 907022730.

Almost surely, 2^261222504912 is an apocalyptic number.

It is an amenable number.

261222504912 is an abundant number, since it is smaller than the sum of its proper divisors (469837700210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261222504912 is a wasteful number, since it uses less digits than its factorization.

261222504912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1814045187 (or 1814045178 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 261222504912 in words is "two hundred sixty-one billion, two hundred twenty-two million, five hundred four thousand, nine hundred twelve".