265661473860 has 72 divisors (see below), whose sum is σ = 806581741056. Its totient is φ = 70777834560.

The previous prime is 265661473843. The next prime is 265661473871. The reversal of 265661473860 is 68374166562.

265661473860 is a `hidden beast` number, since 2 + 6 + 56 + 61 + 473 + 8 + 60 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 265661473797 and 265661473806.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 483226 + ... + 874545.

Almost surely, 2^265661473860 is an apocalyptic number.

265661473860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265661473860 is an abundant number, since it is smaller than the sum of its proper divisors (540920267196).

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

265661473860 is a wasteful number, since it uses less digits than its factorization.

265661473860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358873 (or 1358868 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 265661473860 in words is "two hundred sixty-five billion, six hundred sixty-one million, four hundred seventy-three thousand, eight hundred sixty".