261316113624 has 24 divisors (see below), whose sum is σ = 707731141260. Its totient is φ = 87105371184.

The previous prime is 261316113607. The next prime is 261316113637. The reversal of 261316113624 is 426311613162.

261316113624 is a `hidden beast` number, since 2 + 6 + 1 + 3 + 1 + 611 + 36 + 2 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×261316113624² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1814695162 + ... + 1814695305.

Almost surely, 2^261316113624 is an apocalyptic number.

261316113624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261316113624 is an abundant number, since it is smaller than the sum of its proper divisors (446415027636).

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

261316113624 is a wasteful number, since it uses less digits than its factorization.

261316113624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629390479 (or 3629390472 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

Adding to 261316113624 its reverse (426311613162), we get a palindrome (687627726786).

The spelling of 261316113624 in words is "two hundred sixty-one billion, three hundred sixteen million, one hundred thirteen thousand, six hundred twenty-four".