261534331222624 has 12 divisors (see below), whose sum is σ = 514895714594604. Its totient is φ = 130767165611296.

The previous prime is 261534331222597. The next prime is 261534331222627. The reversal of 261534331222624 is 426222133435162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261534331222627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086473925322 + ... + 4086473925385.

It is an arithmetic number, because the mean of its divisors is an integer number (42907976216217).

Almost surely, 2^{261534331222624} is an apocalyptic number.

It is an amenable number.

261534331222624 is a deficient number, since it is larger than the sum of its proper divisors (253361383371980).

261534331222624 is an equidigital number, since it uses as much as digits as its factorization.

261534331222624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8172947850717 (or 8172947850709 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 46.

Adding to 261534331222624 its reverse (426222133435162), we get a palindrome (687756464657786).

The spelling of 261534331222624 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, three hundred thirty-one million, two hundred twenty-two thousand, six hundred twenty-four".