667765761 has 32 divisors (see below), whose sum is σ = 994344960. Its totient is φ = 395841600.

The previous prime is 667765741. The next prime is 667765783. The reversal of 667765761 is 167567766.

It is not a de Polignac number, because 667765761 - 2⁷ = 667765633 is a prime.

It is a super-2 number, since 2×667765761² = 891822223127818242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667765741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287796 + ... + 290106.

It is an arithmetic number, because the mean of its divisors is an integer number (31073280).

Almost surely, 2^667765761 is an apocalyptic number.

It is an amenable number.

667765761 is a deficient number, since it is larger than the sum of its proper divisors (326579199).

667765761 is a wasteful number, since it uses less digits than its factorization.

667765761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597.

The product of its digits is 2222640, while the sum is 51.

The square root of 667765761 is about 25841.1640798165. The cubic root of 667765761 is about 874.0602748238.

The spelling of 667765761 in words is "six hundred sixty-seven million, seven hundred sixty-five thousand, seven hundred sixty-one".