261644026411 has 8 divisors (see below), whose sum is σ = 277122384000. Its totient is φ = 246175394688.

The previous prime is 261644026387. The next prime is 261644026421. The reversal of 261644026411 is 114620446162.

It is a happy number.

261644026411 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261644026411 - 2¹⁵ = 261643993643 is a prime.

It is a super-3 number, since 3×261644026411³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261644026421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2376036 + ... + 2483713.

It is an arithmetic number, because the mean of its divisors is an integer number (34640298000).

Almost surely, 2^261644026411 is an apocalyptic number.

261644026411 is a deficient number, since it is larger than the sum of its proper divisors (15478357589).

261644026411 is a wasteful number, since it uses less digits than its factorization.

261644026411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4862933.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 261644026411 in words is "two hundred sixty-one billion, six hundred forty-four million, twenty-six thousand, four hundred eleven".