261266178324 has 12 divisors (see below), whose sum is σ = 609621082784. Its totient is φ = 87088726104.

The previous prime is 261266178317. The next prime is 261266178353. The reversal of 261266178324 is 423871662162.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 10886090752 + ... + 10886090775.

Almost surely, 2^261266178324 is an apocalyptic number.

It is an amenable number.

261266178324 is an abundant number, since it is smaller than the sum of its proper divisors (348354904460).

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

261266178324 is a wasteful number, since it uses less digits than its factorization.

261266178324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21772181534 (or 21772181532 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 48.

The spelling of 261266178324 in words is "two hundred sixty-one billion, two hundred sixty-six million, one hundred seventy-eight thousand, three hundred twenty-four".