261243003612 has 24 divisors (see below), whose sum is σ = 611087136912. Its totient is φ = 86863840000.

The previous prime is 261243003607. The next prime is 261243003643. The reversal of 261243003612 is 216300342162.

It is a self number, because there is not a number n which added to its sum of digits gives 261243003612.

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, 27140139 + ... + 27149762.

It is an arithmetic number, because the mean of its divisors is an integer number (25461964038).

Almost surely, 2^261243003612 is an apocalyptic number.

It is an amenable number.

261243003612 is an abundant number, since it is smaller than the sum of its proper divisors (349844133300).

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

261243003612 is a wasteful number, since it uses less digits than its factorization.

261243003612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54290309 (or 54290307 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 261243003612 its reverse (216300342162), we get a palindrome (477543345774).

The spelling of 261243003612 in words is "two hundred sixty-one billion, two hundred forty-three million, three thousand, six hundred twelve".