261216840116 has 6 divisors (see below), whose sum is σ = 457129470210. Its totient is φ = 130608420056.

The previous prime is 261216840097. The next prime is 261216840127. The reversal of 261216840116 is 611048612162.

It can be written as a sum of positive squares in only one way, i.e., 166447680400 + 94769159716 = 407980^2 + 307846^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261216840116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32652105011 + ... + 32652105018.

It is an arithmetic number, because the mean of its divisors is an integer number (76188245035).

Almost surely, 2^261216840116 is an apocalyptic number.

It is an amenable number.

261216840116 is a deficient number, since it is larger than the sum of its proper divisors (195912630094).

261216840116 is a wasteful number, since it uses less digits than its factorization.

261216840116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65304210033 (or 65304210031 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 261216840116 in words is "two hundred sixty-one billion, two hundred sixteen million, eight hundred forty thousand, one hundred sixteen".