261166701 has 4 divisors (see below), whose sum is σ = 348222272. Its totient is φ = 174111132.

The previous prime is 261166693. The next prime is 261166751. The reversal of 261166701 is 107661162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 261166701 - 2³ = 261166693 is a prime.

It is a super-2 number, since 2×261166701² = 136416091422446802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261166751) 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, 43527781 + ... + 43527786.

It is an arithmetic number, because the mean of its divisors is an integer number (87055568).

Almost surely, 2^261166701 is an apocalyptic number.

It is an amenable number.

261166701 is a deficient number, since it is larger than the sum of its proper divisors (87055571).

261166701 is an equidigital number, since it uses as much as digits as its factorization.

261166701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87055570.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 261166701 is about 16160.6528642874. The cubic root of 261166701 is about 639.2036816316.

The spelling of 261166701 in words is "two hundred sixty-one million, one hundred sixty-six thousand, seven hundred one".