261066150 has 72 divisors (see below), whose sum is σ = 713358360. Its totient is φ = 68430720.

The previous prime is 261066133. The next prime is 261066163. The reversal of 261066150 is 51660162.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21634 + ... + 31466.

It is an arithmetic number, because the mean of its divisors is an integer number (9907755).

Almost surely, 2^261066150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261066150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356679180).

261066150 is an abundant number, since it is smaller than the sum of its proper divisors (452292210).

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

261066150 is a wasteful number, since it uses less digits than its factorization.

261066150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9910 (or 9902 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 261066150 is about 16157.5415828028. The cubic root of 261066150 is about 639.1216384776.

The spelling of 261066150 in words is "two hundred sixty-one million, sixty-six thousand, one hundred fifty".