261465164412 has 24 divisors (see below), whose sum is σ = 624965516112. Its totient is φ = 85029321600.

The previous prime is 261465164399. The next prime is 261465164459. The reversal of 261465164412 is 214461564162.

It is a happy number.

261465164412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265716139 + ... + 265717122.

It is an arithmetic number, because the mean of its divisors is an integer number (26040229838).

Almost surely, 2^261465164412 is an apocalyptic number.

It is an amenable number.

261465164412 is an abundant number, since it is smaller than the sum of its proper divisors (363500351700).

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

261465164412 is a wasteful number, since it uses less digits than its factorization.

261465164412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531433309 (or 531433307 counting only the distinct ones).

The product of its digits is 276480, while the sum is 42.

The spelling of 261465164412 in words is "two hundred sixty-one billion, four hundred sixty-five million, one hundred sixty-four thousand, four hundred twelve".