261531431152 has 20 divisors (see below), whose sum is σ = 511365932440. Its totient is φ = 129566029248.

The previous prime is 261531431099. The next prime is 261531431167. The reversal of 261531431152 is 251134135162.

261531431152 is digitally balanced in base 3, 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74978598 + ... + 74982085.

It is an arithmetic number, because the mean of its divisors is an integer number (25568296622).

Almost surely, 2^261531431152 is an apocalyptic number.

It is an amenable number.

261531431152 is a deficient number, since it is larger than the sum of its proper divisors (249834501288).

261531431152 is a wasteful number, since it uses less digits than its factorization.

261531431152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149960800 (or 149960794 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The spelling of 261531431152 in words is "two hundred sixty-one billion, five hundred thirty-one million, four hundred thirty-one thousand, one hundred fifty-two".