261194132188 has 24 divisors (see below), whose sum is σ = 498658834800. Its totient is φ = 118720917120.

The previous prime is 261194132137. The next prime is 261194132249. The reversal of 261194132188 is 881231491162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1756720 + ... + 1899592.

It is an arithmetic number, because the mean of its divisors is an integer number (20777451450).

Almost surely, 2^261194132188 is an apocalyptic number.

It is an amenable number.

261194132188 is a deficient number, since it is larger than the sum of its proper divisors (237464702612).

261194132188 is a wasteful number, since it uses less digits than its factorization.

261194132188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184437 (or 184435 counting only the distinct ones).

The product of its digits is 165888, while the sum is 46.

The spelling of 261194132188 in words is "two hundred sixty-one billion, one hundred ninety-four million, one hundred thirty-two thousand, one hundred eighty-eight".