666741567 has 4 divisors (see below), whose sum is σ = 888988760. Its totient is φ = 444494376.

The previous prime is 666741563. The next prime is 666741611. The reversal of 666741567 is 765147666.

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

It is not a de Polignac number, because 666741567 - 2² = 666741563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666741563) 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, 111123592 + ... + 111123597.

It is an arithmetic number, because the mean of its divisors is an integer number (222247190).

Almost surely, 2^666741567 is an apocalyptic number.

666741567 is a deficient number, since it is larger than the sum of its proper divisors (222247193).

666741567 is a wasteful number, since it uses less digits than its factorization.

666741567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222247192.

The product of its digits is 1270080, while the sum is 48.

The square root of 666741567 is about 25821.3393726971. The cubic root of 666741567 is about 873.6131792452.

The spelling of 666741567 in words is "six hundred sixty-six million, seven hundred forty-one thousand, five hundred sixty-seven".