261672227066 has 8 divisors (see below), whose sum is σ = 393307748064. Its totient is φ = 130569644380.

The previous prime is 261672227059. The next prime is 261672227129. The reversal of 261672227066 is 660722276162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261672227066.

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, 133233350 + ... + 133235313.

It is an arithmetic number, because the mean of its divisors is an integer number (49163468508).

Almost surely, 2^261672227066 is an apocalyptic number.

261672227066 is a deficient number, since it is larger than the sum of its proper divisors (131635520998).

261672227066 is a wasteful number, since it uses less digits than its factorization.

261672227066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266469156.

The product of its (nonzero) digits is 1016064, while the sum is 47.

The spelling of 261672227066 in words is "two hundred sixty-one billion, six hundred seventy-two million, two hundred twenty-seven thousand, sixty-six".