261601263416 has 32 divisors (see below), whose sum is σ = 512588355840. Its totient is φ = 125040477408.

The previous prime is 261601263367. The next prime is 261601263439. The reversal of 261601263416 is 614362106162.

It is a self number, because there is not a number n which added to its sum of digits gives 261601263416.

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, 8073926 + ... + 8106261.

It is an arithmetic number, because the mean of its divisors is an integer number (16018386120).

Almost surely, 2^261601263416 is an apocalyptic number.

It is an amenable number.

261601263416 is a deficient number, since it is larger than the sum of its proper divisors (250987092424).

261601263416 is a wasteful number, since it uses less digits than its factorization.

261601263416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16180283 (or 16180279 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

Adding to 261601263416 its reverse (614362106162), we get a palindrome (875963369578).

The spelling of 261601263416 in words is "two hundred sixty-one billion, six hundred one million, two hundred sixty-three thousand, four hundred sixteen".