261455266 has 16 divisors (see below), whose sum is σ = 404507520. Its totient is φ = 126674800.

The previous prime is 261455263. The next prime is 261455269. The reversal of 261455266 is 662554162.

It is an interprime number because it is at equal distance from previous prime (261455263) and next prime (261455269).

It is a super-2 number, since 2×261455266² = 136717712238261512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261455261) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4276 + ... + 23263.

It is an arithmetic number, because the mean of its divisors is an integer number (25281720).

Almost surely, 2^261455266 is an apocalyptic number.

261455266 is a deficient number, since it is larger than the sum of its proper divisors (143052254).

261455266 is a wasteful number, since it uses less digits than its factorization.

261455266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27689.

The product of its digits is 86400, while the sum is 37.

The square root of 261455266 is about 16169.5784113254. The cubic root of 261455266 is about 639.4390152548.

The spelling of 261455266 in words is "two hundred sixty-one million, four hundred fifty-five thousand, two hundred sixty-six".