261230066 has 4 divisors (see below), whose sum is σ = 391845102. Its totient is φ = 130615032.

The previous prime is 261230063. The next prime is 261230083. The reversal of 261230066 is 660032162.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 252651025 + 8579041 = 15895^2 + 2929^2 .

It is a super-2 number, since 2×261230066² = 136482294764728712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261230063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65307515 + ... + 65307518.

Almost surely, 2^261230066 is an apocalyptic number.

261230066 is a deficient number, since it is larger than the sum of its proper divisors (130615036).

261230066 is a wasteful number, since it uses less digits than its factorization.

261230066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130615035.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 261230066 is about 16162.6132169275. The cubic root of 261230066 is about 639.2553725834.

The spelling of 261230066 in words is "two hundred sixty-one million, two hundred thirty thousand, sixty-six".