261686546 has 64 divisors (see below), whose sum is σ = 461894400. Its totient is φ = 110073600.

The previous prime is 261686527. The next prime is 261686549. The reversal of 261686546 is 645686162.

It is a junction number, because it is equal to n+sod(n) for n = 261686497 and 261686506.

It is not an unprimeable number, because it can be changed into a prime (261686549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2400740 + ... + 2400848.

It is an arithmetic number, because the mean of its divisors is an integer number (7217100).

Almost surely, 2^261686546 is an apocalyptic number.

261686546 is a deficient number, since it is larger than the sum of its proper divisors (200207854).

261686546 is a wasteful number, since it uses less digits than its factorization.

261686546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275.

The product of its digits is 414720, while the sum is 44.

The square root of 261686546 is about 16176.7285320611. The cubic root of 261686546 is about 639.6275062244.

The spelling of 261686546 in words is "two hundred sixty-one million, six hundred eighty-six thousand, five hundred forty-six".