261223191671 has 6 divisors (see below), whose sum is σ = 282862982880. Its totient is φ = 241129099848.

The previous prime is 261223191661. The next prime is 261223191737. The reversal of 261223191671 is 176191322162.

It is a de Polignac number, because none of the positive numbers 2^k-261223191671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261223191661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 772849511 + ... + 772849848.

It is an arithmetic number, because the mean of its divisors is an integer number (47143830480).

Almost surely, 2^261223191671 is an apocalyptic number.

261223191671 is a deficient number, since it is larger than the sum of its proper divisors (21639791209).

261223191671 is a wasteful number, since it uses less digits than its factorization.

261223191671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545699385 (or 1545699372 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The spelling of 261223191671 in words is "two hundred sixty-one billion, two hundred twenty-three million, one hundred ninety-one thousand, six hundred seventy-one".