261530617072 has 40 divisors (see below), whose sum is σ = 521535129536. Its totient is φ = 126956180736.

The previous prime is 261530617069. The next prime is 261530617081. The reversal of 261530617072 is 270716035162.

261530617072 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261530617072² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 202983 + ... + 751174.

Almost surely, 2^261530617072 is an apocalyptic number.

It is an amenable number.

261530617072 is a deficient number, since it is larger than the sum of its proper divisors (260004512464).

261530617072 is a wasteful number, since it uses less digits than its factorization.

261530617072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954665 (or 954659 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 261530617072 in words is "two hundred sixty-one billion, five hundred thirty million, six hundred seventeen thousand, seventy-two".