261543674101444 has 24 divisors (see below), whose sum is σ = 523087918234560. Its totient is φ = 112090023893856.

The previous prime is 261543674101427. The next prime is 261543674101459. The reversal of 261543674101444 is 444101476345162.

It is a junction number, because it is equal to n+sod(n) for n = 261543674101391 and 261543674101400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23975274 + ... + 33134590.

It is an arithmetic number, because the mean of its divisors is an integer number (21795329926440).

Almost surely, 2^{261543674101444} is an apocalyptic number.

It is an amenable number.

261543674101444 is an abundant number, since it is smaller than the sum of its proper divisors (261544244133116).

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

261543674101444 is a wasteful number, since it uses less digits than its factorization.

261543674101444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10179147 (or 10179145 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 52.

The spelling of 261543674101444 in words is "two hundred sixty-one trillion, five hundred forty-three billion, six hundred seventy-four million, one hundred one thousand, four hundred forty-four".