261655505672514 has 16 divisors (see below), whose sum is σ = 529615963289952. Its totient is φ = 86167676566688.

The previous prime is 261655505672417. The next prime is 261655505672537. The reversal of 261655505672514 is 415276505556162.

It is a Curzon 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, 262706330499 + ... + 262706331494.

It is an arithmetic number, because the mean of its divisors is an integer number (33100997705622).

Almost surely, 2^{261655505672514} is an apocalyptic number.

261655505672514 is an abundant number, since it is smaller than the sum of its proper divisors (267960457617438).

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

261655505672514 is a wasteful number, since it uses less digits than its factorization.

261655505672514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525412662081.

The product of its (nonzero) digits is 75600000, while the sum is 60.

The spelling of 261655505672514 in words is "two hundred sixty-one trillion, six hundred fifty-five billion, five hundred five million, six hundred seventy-two thousand, five hundred fourteen".