261266022624 has 96 divisors (see below), whose sum is σ = 753307188480. Its totient is φ = 78917870592.

The previous prime is 261266022623. The next prime is 261266022691. The reversal of 261266022624 is 426220662162.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261266022623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3071917 + ... + 3155820.

It is an arithmetic number, because the mean of its divisors is an integer number (7846949880).

Almost surely, 2^261266022624 is an apocalyptic number.

261266022624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261266022624 is an abundant number, since it is smaller than the sum of its proper divisors (492041165856).

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

261266022624 is a wasteful number, since it uses less digits than its factorization.

261266022624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6227792 (or 6227784 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 39.

Adding to 261266022624 its reverse (426220662162), we get a palindrome (687486684786).

The spelling of 261266022624 in words is "two hundred sixty-one billion, two hundred sixty-six million, twenty-two thousand, six hundred twenty-four".