261788185472 has 32 divisors (see below), whose sum is σ = 568943076600. Its totient is φ = 118994629120.

The previous prime is 261788185457. The next prime is 261788185489. The reversal of 261788185472 is 274581887162.

261788185472 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92963147 + ... + 92965962.

Almost surely, 2^261788185472 is an apocalyptic number.

261788185472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

261788185472 is an abundant number, since it is smaller than the sum of its proper divisors (307154891128).

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

261788185472 is a wasteful number, since it uses less digits than its factorization.

261788185472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185929134 (or 185929122 counting only the distinct ones).

The product of its digits is 12042240, while the sum is 59.

The spelling of 261788185472 in words is "two hundred sixty-one billion, seven hundred eighty-eight million, one hundred eighty-five thousand, four hundred seventy-two".