261140201366 has 32 divisors (see below), whose sum is σ = 431811330048. Its totient is φ = 117457482240.

The previous prime is 261140201317. The next prime is 261140201393. The reversal of 261140201366 is 663102041162.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 948086 + ... + 1192118.

It is an arithmetic number, because the mean of its divisors is an integer number (13494104064).

Almost surely, 2^261140201366 is an apocalyptic number.

261140201366 is a deficient number, since it is larger than the sum of its proper divisors (170671128682).

261140201366 is a wasteful number, since it uses less digits than its factorization.

261140201366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244556.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 261140201366 in words is "two hundred sixty-one billion, one hundred forty million, two hundred one thousand, three hundred sixty-six".