261501243596 has 24 divisors (see below), whose sum is σ = 463452433920. Its totient is φ = 129086494992.

The previous prime is 261501243583. The next prime is 261501243643. The reversal of 261501243596 is 695342105162.

It is a super-2 number, since 2×261501243596² (a number of 24 digits) contains 22 as substring.

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, 7935065 + ... + 7967951.

It is an arithmetic number, because the mean of its divisors is an integer number (19310518080).

Almost surely, 2^261501243596 is an apocalyptic number.

It is an amenable number.

261501243596 is a deficient number, since it is larger than the sum of its proper divisors (201951190324).

261501243596 is a wasteful number, since it uses less digits than its factorization.

261501243596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58133 (or 58131 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 261501243596 in words is "two hundred sixty-one billion, five hundred one million, two hundred forty-three thousand, five hundred ninety-six".