261446981401 has 4 divisors (see below), whose sum is σ = 261670250704. Its totient is φ = 261223712100.

The previous prime is 261446981387. The next prime is 261446981407. The reversal of 261446981401 is 104189644162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261446981401 - 2⁹ = 261446980889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261446981407) 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 3 ways as a sum of consecutive naturals, for example, 111632895 + ... + 111635236.

It is an arithmetic number, because the mean of its divisors is an integer number (65417562676).

Almost surely, 2^261446981401 is an apocalyptic number.

It is an amenable number.

261446981401 is a deficient number, since it is larger than the sum of its proper divisors (223269303).

261446981401 is a wasteful number, since it uses less digits than its factorization.

261446981401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223269302.

The product of its (nonzero) digits is 331776, while the sum is 46.

The spelling of 261446981401 in words is "two hundred sixty-one billion, four hundred forty-six million, nine hundred eighty-one thousand, four hundred one".