261065043 has 12 divisors (see below), whose sum is σ = 389258688. Its totient is φ = 168428880.

The previous prime is 261065041. The next prime is 261065069. The reversal of 261065043 is 340560162.

261065043 is a `hidden beast` number, since 2 + 6 + 1 + 0 + 650 + 4 + 3 = 666.

It is not a de Polignac number, because 261065043 - 2¹ = 261065041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261064998 and 261065016.

It is not an unprimeable number, because it can be changed into a prime (261065041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 467580 + ... + 468137.

It is an arithmetic number, because the mean of its divisors is an integer number (32438224).

Almost surely, 2^261065043 is an apocalyptic number.

261065043 is a deficient number, since it is larger than the sum of its proper divisors (128193645).

261065043 is a wasteful number, since it uses less digits than its factorization.

261065043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935754 (or 935751 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 261065043 is about 16157.5073263174. The cubic root of 261065043 is about 639.1207351195.

The spelling of 261065043 in words is "two hundred sixty-one million, sixty-five thousand, forty-three".