261432660004428 has 192 divisors, whose sum is σ = 682856974356480. Its totient is φ = 77179984358400.

The previous prime is 261432660004331. The next prime is 261432660004433. The reversal of 261432660004428 is 824400066234162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 353362878 + ... + 354101946.

It is an arithmetic number, because the mean of its divisors is an integer number (3556546741440).

Almost surely, 2^{261432660004428} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261432660004428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341428487178240).

261432660004428 is an abundant number, since it is smaller than the sum of its proper divisors (421424314352052).

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

261432660004428 is a wasteful number, since it uses less digits than its factorization.

261432660004428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739568 (or 739566 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 48.

The spelling of 261432660004428 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, six hundred sixty million, four thousand, four hundred twenty-eight".