261243505062 has 24 divisors (see below), whose sum is σ = 575621284680. Its totient is φ = 85605216000.

The previous prime is 261243505043. The next prime is 261243505073. The reversal of 261243505062 is 260505342162.

261243505062 is a `hidden beast` number, since 2 + 61 + 2 + 43 + 50 + 506 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122994939 + ... + 122997062.

It is an arithmetic number, because the mean of its divisors is an integer number (23984220195).

Almost surely, 2^261243505062 is an apocalyptic number.

261243505062 is an abundant number, since it is smaller than the sum of its proper divisors (314377779618).

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

261243505062 is a wasteful number, since it uses less digits than its factorization.

261243505062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245992068 (or 245992065 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 261243505062 in words is "two hundred sixty-one billion, two hundred forty-three million, five hundred five thousand, sixty-two".