261066361 has 8 divisors (see below), whose sum is σ = 265019904. Its totient is φ = 257120640.

The previous prime is 261066343. The next prime is 261066389. The reversal of 261066361 is 163660162.

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

It is a cyclic number.

It is not a de Polignac number, because 261066361 - 2²⁷ = 126848633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261066391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128425 + ... + 130441.

It is an arithmetic number, because the mean of its divisors is an integer number (33127488).

Almost surely, 2^261066361 is an apocalyptic number.

It is an amenable number.

261066361 is a deficient number, since it is larger than the sum of its proper divisors (3953543).

261066361 is a wasteful number, since it uses less digits than its factorization.

261066361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 261066361 is about 16157.5481122601. The cubic root of 261066361 is about 639.1218106621.

The spelling of 261066361 in words is "two hundred sixty-one million, sixty-six thousand, three hundred sixty-one".