261772667 has 8 divisors (see below), whose sum is σ = 283599456. Its totient is φ = 240187392.

The previous prime is 261772631. The next prime is 261772673. The reversal of 261772667 is 766277162.

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

It is a cyclic number.

It is not a de Polignac number, because 261772667 - 2⁶ = 261772603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261772607) 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, 58118 + ... + 62459.

It is an arithmetic number, because the mean of its divisors is an integer number (35449932).

Almost surely, 2^261772667 is an apocalyptic number.

261772667 is a deficient number, since it is larger than the sum of its proper divisors (21826789).

261772667 is a wasteful number, since it uses less digits than its factorization.

261772667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120757.

The product of its digits is 296352, while the sum is 44.

The square root of 261772667 is about 16179.3901924640. The cubic root of 261772667 is about 639.6976656315.

The spelling of 261772667 in words is "two hundred sixty-one million, seven hundred seventy-two thousand, six hundred sixty-seven".