261421660425110 has 16 divisors (see below), whose sum is σ = 476515431662400. Its totient is φ = 103245010192896.

The previous prime is 261421660425103. The next prime is 261421660425127. The reversal of 261421660425110 is 11524066124162.

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, 165456746315 + ... + 165456747894.

It is an arithmetic number, because the mean of its divisors is an integer number (29782214478900).

Almost surely, 2^{261421660425110} is an apocalyptic number.

261421660425110 is a deficient number, since it is larger than the sum of its proper divisors (215093771237290).

261421660425110 is a wasteful number, since it uses less digits than its factorization.

261421660425110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330913494295.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 261421660425110 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, six hundred sixty million, four hundred twenty-five thousand, one hundred ten".