261501667 has 8 divisors (see below), whose sum is σ = 316439136. Its totient is φ = 210959232.

The previous prime is 261501631. The next prime is 261501707. The reversal of 261501667 is 766105162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261501667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261501167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1098628 + ... + 1098865.

It is an arithmetic number, because the mean of its divisors is an integer number (39554892).

Almost surely, 2^261501667 is an apocalyptic number.

261501667 is a deficient number, since it is larger than the sum of its proper divisors (54937469).

261501667 is a wasteful number, since it uses less digits than its factorization.

261501667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197517.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 261501667 is about 16171.0131717218. The cubic root of 261501667 is about 639.4768405332.

The spelling of 261501667 in words is "two hundred sixty-one million, five hundred one thousand, six hundred sixty-seven".