261446981446 has 16 divisors (see below), whose sum is σ = 448894052640. Its totient is φ = 111873899520.

The previous prime is 261446981407. The next prime is 261446981447. The reversal of 261446981446 is 644189644162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261446981447) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14557941 + ... + 14575888.

It is an arithmetic number, because the mean of its divisors is an integer number (28055878290).

Almost surely, 2^261446981446 is an apocalyptic number.

261446981446 is a deficient number, since it is larger than the sum of its proper divisors (187447071194).

261446981446 is a wasteful number, since it uses less digits than its factorization.

261446981446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29134479.

The product of its digits is 7962624, while the sum is 55.

The spelling of 261446981446 in words is "two hundred sixty-one billion, four hundred forty-six million, nine hundred eighty-one thousand, four hundred forty-six".