261432466 has 4 divisors (see below), whose sum is σ = 392148702. Its totient is φ = 130716232.

The previous prime is 261432439. The next prime is 261432497. The reversal of 261432466 is 664234162.

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., 176331841 + 85100625 = 13279^2 + 9225^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65358115 + ... + 65358118.

Almost surely, 2^261432466 is an apocalyptic number.

261432466 is a deficient number, since it is larger than the sum of its proper divisors (130716236).

261432466 is a wasteful number, since it uses less digits than its factorization.

261432466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130716235.

The product of its digits is 41472, while the sum is 34.

The square root of 261432466 is about 16168.8733682963. The cubic root of 261432466 is about 639.4204274563.

The spelling of 261432466 in words is "two hundred sixty-one million, four hundred thirty-two thousand, four hundred sixty-six".