261066471 has 8 divisors (see below), whose sum is σ = 348678000. Its totient is φ = 173749632.

The previous prime is 261066437. The next prime is 261066473. The reversal of 261066471 is 174660162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261066471 - 2⁷ = 261066343 is a prime.

It is a super-3 number, since 3×261066471³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261066473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71596 + ... + 75153.

It is an arithmetic number, because the mean of its divisors is an integer number (43584750).

Almost surely, 2^261066471 is an apocalyptic number.

261066471 is a deficient number, since it is larger than the sum of its proper divisors (87611529).

261066471 is a wasteful number, since it uses less digits than its factorization.

261066471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147345.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 261066471 is about 16157.5515162416. The cubic root of 261066471 is about 639.1219004265.

The spelling of 261066471 in words is "two hundred sixty-one million, sixty-six thousand, four hundred seventy-one".