261166667 has 4 divisors (see below), whose sum is σ = 261573480. Its totient is φ = 260759856.

The previous prime is 261166621. The next prime is 261166691. The reversal of 261166667 is 766661162.

261166667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 261166667 - 2¹⁶ = 261101131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261162667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202442 + ... + 203727.

It is an arithmetic number, because the mean of its divisors is an integer number (65393370).

Almost surely, 2^261166667 is an apocalyptic number.

261166667 is a deficient number, since it is larger than the sum of its proper divisors (406813).

261166667 is an equidigital number, since it uses as much as digits as its factorization.

261166667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406812.

The product of its digits is 108864, while the sum is 41.

The square root of 261166667 is about 16160.6518123496. The cubic root of 261166667 is about 639.2036538933.

The spelling of 261166667 in words is "two hundred sixty-one million, one hundred sixty-six thousand, six hundred sixty-seven".