261055302464 has 56 divisors (see below), whose sum is σ = 571934266848. Its totient is φ = 117231818240.

The previous prime is 261055302461. The next prime is 261055302553. The reversal of 261055302464 is 464203550162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261055302461) 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 7 ways as a sum of consecutive naturals, for example, 2175407 + ... + 2292270.

It is an arithmetic number, because the mean of its divisors is an integer number (10213111908).

Almost surely, 2^261055302464 is an apocalyptic number.

It is an amenable number.

261055302464 is an abundant number, since it is smaller than the sum of its proper divisors (310878964384).

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

261055302464 is a wasteful number, since it uses less digits than its factorization.

261055302464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4467783 (or 4467773 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 261055302464 in words is "two hundred sixty-one billion, fifty-five million, three hundred two thousand, four hundred sixty-four".