261215403350 has 48 divisors (see below), whose sum is σ = 553074600960. Its totient is φ = 90857527200.

The previous prime is 261215403343. The next prime is 261215403367. The reversal of 261215403350 is 53304512162.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10312070 + ... + 10337369.

It is an arithmetic number, because the mean of its divisors is an integer number (11522387520).

Almost surely, 2^261215403350 is an apocalyptic number.

261215403350 is an abundant number, since it is smaller than the sum of its proper divisors (291859197610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261215403350 is a wasteful number, since it uses less digits than its factorization.

261215403350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20649485 (or 20649480 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 261215403350 in words is "two hundred sixty-one billion, two hundred fifteen million, four hundred three thousand, three hundred fifty".