261203660 has 12 divisors (see below), whose sum is σ = 548527728. Its totient is φ = 104481456.

The previous prime is 261203641. The next prime is 261203687. The reversal of 261203660 is 66302162.

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, 6530072 + ... + 6530111.

It is an arithmetic number, because the mean of its divisors is an integer number (45710644).

Almost surely, 2^261203660 is an apocalyptic number.

261203660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261203660 is an abundant number, since it is smaller than the sum of its proper divisors (287324068).

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

261203660 is a wasteful number, since it uses less digits than its factorization.

261203660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13060192 (or 13060190 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 261203660 is about 16161.7963110540. The cubic root of 261203660 is about 639.2338325077.

The spelling of 261203660 in words is "two hundred sixty-one million, two hundred three thousand, six hundred sixty".