261878681875672 has 32 divisors (see below), whose sum is σ = 504295934526720. Its totient is φ = 127399801466880.

The previous prime is 261878681875669. The next prime is 261878681875673. The reversal of 261878681875672 is 276578186878162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261878681875673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59891608 + ... + 64115224.

It is an arithmetic number, because the mean of its divisors is an integer number (15759247953960).

Almost surely, 2^{261878681875672} is an apocalyptic number.

It is an amenable number.

261878681875672 is a deficient number, since it is larger than the sum of its proper divisors (242417252651048).

261878681875672 is a wasteful number, since it uses less digits than its factorization.

261878681875672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4433131 (or 4433127 counting only the distinct ones).

The product of its digits is 6069288960, while the sum is 82.

The spelling of 261878681875672 in words is "two hundred sixty-one trillion, eight hundred seventy-eight billion, six hundred eighty-one million, eight hundred seventy-five thousand, six hundred seventy-two".