261670766 has 32 divisors (see below), whose sum is σ = 477461952. Its totient is φ = 104993280.

The previous prime is 261670757. The next prime is 261670807. The reversal of 261670766 is 667076162.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 44096 + ... + 49676.

It is an arithmetic number, because the mean of its divisors is an integer number (14920686).

Almost surely, 2^261670766 is an apocalyptic number.

261670766 is a deficient number, since it is larger than the sum of its proper divisors (215791186).

261670766 is a wasteful number, since it uses less digits than its factorization.

261670766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5804.

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 261670766 is about 16176.2407870308. The cubic root of 261670766 is about 639.6146492077.

The spelling of 261670766 in words is "two hundred sixty-one million, six hundred seventy thousand, seven hundred sixty-six".